Despite being an ecchi comedy that borders on straight up porn at least in the anime, it goes well out of its way to deconstruct itself in a realistic fashion. At least as realistic as a High Fantasy Sex Comedy can be.
- Biology plays a big role in this work; this ends up making sure someone in the review team loses out whenever they all go to the same brothel for a review session of the ladies.:
- Extreme size disparity of man and woman is not practical and is literally impossible in some cases. Fairies need to measure prospective male partners, and Kanchal has trouble taking the body weight of a Dagon lost in her pleasure, although he admits that he has become quite skilled in pleasing women who are larger than him in general as a result of practice.
- The elvish mana sense affects their taste in women. Despite retaining their youthful good looks, older elves tend to have their mana stagnate and become unappealing to those of magical persuasion. It is also shown by Zel and the elf succu-girls that while elves normally have a slower sex drive, they tend to synchronise with the sexual appetites of their partners and gain more active sex drives if, for example, they had sex with humans that have much more voracious appetites for sex.
- Brooz, as a hybrid dogman, has a strong sense of smell that makes him picky about the scent of his partners, and cannot enjoy minotaur woman's milk because his canine stomach can't digest it properly.
- As a result of their amorphous bodies and ability to pleasure women without causing undue internal discomfort, slimes are very popular at the Genderswap Inn.
- Egglaying races easily get hungry or hot and bothered by The Warm Raw Egg's egglaying show, but live birth/mammalians like humans and elves don't see the appeal.
- The Incubus Lord that pops up in volume 3 has an additional heart inside his pelvis to ensure he can keep his genitalia well-circulated with fresh blood while retaining his ability to pleasure many women in a single day. Due to this, it's also a serious weakspot, as damage to this heart will kill an incubus very quickly.
- The Mimics in Chapter 35 choose and inhabit containers almost like Hermit Crabs, and exhibit biological characteristics like certain species of molluscs - they possess a large fleshy 'foot' of a lower body that anchors inside their chosen container, plus a large, muscular, tongue-like appendage that they use in ambush to catch prey. While male mimics are not shown in the chapter, the way they engulf their non-mimic 'mates' as depicted indicates that their upper torsos embrace while they mate, and they wrap their feet around each other protectively while doing so.
- The Arachnes seen in Chapter 39 use their legs to feel the vibration of their web tripwires; this means that their legs are very sensitive to touch, as Zel elaborates in his review. Due to their reliance on their ambush predator gimmicks for their succu-girl joint, some of the Reviewers end up not enjoying the session - Crim gets caught and manhandled without any intimate moments, Stunk doesn't like being completely bound up by his arachne, and Kanchal ends up too engaged with the 'dungeon' gimmick and ends up not getting caught.
- Chapter 42 reveals that the reason why the C-team Reviewers don't join Stunk, Zel, and Kanchal on their regular visits to succu-girls is due to their strong natural instincts, which colours their tastes and habits to the point where it can be troublesome to bring them along. In addition, it is shown that there can be issues due to the survival and hunting instincts kicking in where predator-prey relationships are in play, with the adrenaline rush caused by said instincts being easily confused with their love or lust.
- Chapter 46 goes more into detail about the pollination habits of plant people, especially those that can propagate by airborne pollen. It also illustrates that due to the many dietary needs of all the different peoples, food caterers need to be trained on the preferences of various species - Ivy is shown to keep a giant cookbook for the all the recipes she needs to keep in mind.
- Chapter 47 shows a group of merfolk that demonstrate a protogynous gender-bending mechanic
similar to certain species of clownfish, where the most dominant person becomes male and the others become female.
- Personal preference colors each man's review as well, such as Crim giving birdmaids a 7 due to preferring a more dominant partner, or Stunk not being into halfling ladies because their short height coupled with their cute looks makes them look too young for his tastes.
- Crim is still reluctant to go out, but when he's told he's too big at the fairy club, he's mad rather than relieved he has no options. The biggest factor is that he still had to pay upfront and wasn't given a refund. Even though Crim is very forgiving, such as forgiving his friends for taking him to brothels even though he's uncomfortable with the idea, mainly because they see it a nice gesture, but being scammed by the fairies upsets him enough that he's the first reviewer to give a zero.
- Due to the extreme size of their breasts, minotaur females are very muscular in order to be able to carry their chests without difficulty. Also, just like real cows, only those who have had kids can produce milk. In addition, milk-bearing makes their breast tissue tougher as a result of developing the milk glands.
- Due to some demons being treacherous people, it negatively impacted their reputation and made it difficult for Demon Lords to win the elections. The trip to the Demon's Hole reveals that some of the horror stories about abusive demons resulted from poorly-worded marriage contracts causing demon wives to take advantage of their husbands. Demon Two admits that while the Reviewers wouldn't change things overnight for demons, and that he expected the changes to be gradual and possibly take a century or two to bear fruit, it was a strong start for bringing people around to being more accepting of the ways of demons; after all, if Deathabyss is voted into power as a result of a properly-worded electoral contract, she would honor everything about it and not welch on any promises made.
- As a result of previous patrons abusing the gender-bending potion, the establishment that offers the potion no longer allows customers to leave the premises while under the potion's effects.
- The guys are okay with checking each other out when they have been transformed into women, but reject the idea of sleeping with men in any form, even women turned into men. They also have a much smaller selection of women to choose from, as most of the girls are not into women, including men turned into women.
- No matter how attractive she is, or even her offering a discount, Zel and Stunk turn down sleeping with Tiaplate the salamander as her body is literally hot enough to cook meat. She happily clings to Crim when she realizes he's interested and fire-resistant. When they try out Demia's newly-developed Fire Resistance Rings in chapter 36, the elemental protection from the rings only affects their bodies and not their clothing, and the insides of a salamander are still hot enough to make sex mildly unpleasant, causing Demia to muse that the rings need more work; Deathabyss, not being in the mood for any ribald shenanigans, gets annoyed when Demia asks her to try sausage that she cooked using Tiaplate's lower orifices.
- Crim is the least experienced of the guys, so he has some self-control issues in the form of keeping calm. The salamander girl latches onto him when she notices Crim is obviously turned on.
- Stunk and Zel point out that guys usually pick up the scent of the partner, such as smelling of perfume after sex. They both note how Crim smells of barbeque thanks to sleeping with Tiaplate, who they were cooking meat off of.
- A brothel full of horny lilim gets very low scores, due to the fact patrons can die because the lilim will keep going even if they’re tapped out and exhausted, and there’s no measures, other than a warning before they enter, in place to ensure the patrons' safety.
- With so many different brothels to choose from, it is entirely possible for some sex workers, like Guinea the minotaur in chapter 10/episode 5, to not see any action that day.
- In chapter 12/episode 5, the madam of the myconid brothel can distinguish a man's preference with a look, however, she is stumped by Crim. She's never seen an angel before, so she can't know their general preference, and what she can intuit, like his shy nature contrasting with the fact he came to a brothel, leaves her confused. In addition, Zel's review and a page from from the bonus manga at the end of volume 2 shows that myconids with poisonous or toxic properties exist, so her recommendations are actually very important, in order to avoid prospective clients getting accidentally poisoned or suffering allergic reactions.
- While they never actually laid a hand on Meidri proper in chapter 13/episode 6, the Reviewers DID make sufficiently-realistic copies of Meidri for their golem review that the real Meidri is both offended and creeped out when she puts two and two together, resulting in her beating all of them up in anger. As Crim was complicit in having a Meidri golem for himself, he isn't exempt from punishment and gets pummeled alongside the rest of the lads.
- The owl birdmaid hostess running the egg-laying show warns the Reviewers that there are no guarantees as to the number of ladies willing to show up to lay their eggs on-stage, the egg-laying is a natural process that can't be staged after all, and there are also no guarantees as to what species turn up, ranging from birdmaids and reptillian women to mermaids and even sapient anemones. Stunk, Zel, and Crim eventually nearly get bored and almost leave before a penguin birdmaid 'idol' finally shows up, and they don't really get the significance of laying three eggs, where the regulars go wild at the implications thereof. On top of all this, no matter how intimidating a reptillian woman looks, she can still get creeped out and frightened when the male lamias get too pushy after she's laid her eggs.
- Having sex with succubi may be a pleasure that's out of this world, but it is also very soul-draining, like the myths actual succubi are based off of. Despite succubi making perfect prostitutes, this is one reason why men don't sleep with them more often, unless it calls for a journey where they won't get any for a while.
- The undead are shown to be mostly unpopular, due to their cold bodies and the smell of death that permeates them, as well as the more extreme examples like the ghosts and skeletons having no flesh to enjoy the pleasures of the flesh with. The one person shown with undead in their harem is a vampire himself, and the vampiresses in said harem approached him of their own volition to preserve their physical beauty since he doesn't go around making trouble for people and instead sleeps for decades in his coffin.
- Other adventurers start posting their own reviews, causing a double dose of this trope.
- Stunk and Zel are offended that people are copying them.
- They can do nothing. The reviewers are using pseudonyms and live in an internet-free world. Also, the guys can't legally own the concept of posting their opinions on the tavern boards, so they can't make the others stop.
- While Demia's clones allow you to do whatever you want with them (for a price), the only rule is that you have to keep it all indoors or in private, as Demia previously got in trouble when her clones ended up being 'used' in public all over the city, disrupting daily life. Furthermore, if you're too rough with the clones, it will shorten their lifespan due to damage.
- If you're not a centaur or something, er, comparable, you're not gonna have a lot of fun with a centaur girl unless you're the giving type and/or your arm's feeling cold. You might think their human half can make up for it, but since their species is focused on developing their lower halves, their upper halves are clumsy and uncoordinated.
- Crim gets paid less money at his day job at Ye Pubbe because he keeps getting dragged off by Stunk and Zel while he is in the middle of working (specifically, that time he skipped out of work for two weeks to go to Magic City). As a result, he has to work even harder to get more money and survive the month. In addition, when Stunk and Zel try to drag Crim off to another brothel while he is trying to earnestly work, Meidri angrily demands they wait until he is done his shift because whenever they do drag him off, it forces more work on her.
- The incubus's reviews are worthless to the Interspecies Reviewers because the reviews are only 10/10 because the Incubus gives all women a 10/10 just for being women and that he does not account for the fact that there are species that can't sleep with other species, like the salamanders for most people or the fairies for the larger species, nor the fact that he has the abilities to do what other species could not do.
- Oni can be quite possessive of their own. Incubi are known to have insatiable sexual appetites. The one incubus shown in the series has an oni girlfriend, but his tendency to go after other women results in his significant other getting angry at his infidelity, on top of using her money to pay for succu-girls. He gets stabbed, but survives since his more critical second heart is undamaged. She stabs him out of anger at his infidelity, but ends up getting arrested for domestic violence. The main Reviewer team takes one look at the mess and decides not to risk any controversy by not publishing the reviews done by the incubus.
- The guys lost their money by going on a crawl, not just at the leprechaun brothel. The amount of gold they had was far too large to spend at a single establishment. Also, the reviews they wrote down were terrible due to their intoxication, and Stunk is shown on-screen having performance issues due to being too drunk to get it up properly.
- When Deathabyss and Demia discuss the knowledge of technology from people that were sent to this world from another realm, Demia has to admit that there are factors and conditions in this world that make replicating certain technologies wholesale impractical and dangerous, such as mana walls interfering with potential aircraft flight lanes in the sky, making it difficult to replicate certain kinds of modern technology without reverse-engineering it and redesigning it to function in a mana-rich world. For example, she reverse engineered the physics behind modern aircraft aerodynamics as she picked up from these 'isekai'd' people and used the resulting principles to beef up her flying broomstick until it completely outperformed all other rival models. While Deathabyss is interested in funding Demia's work in this direction, she first needs to win the elections and get voted into the government before she can devote a budget to doing so.
- Crim's experiences with the dream-eater were soured by the fact that he knew that the encounters inside the dream were only part of his fantasies and not reality, and he really wanted a chance to visit Elza again in the real world.
- The Aquari-Harem has some unusual side effects from possessing animals that linger for a few days. Discworld Witches (or those who know about Borrowing and similar possession-based abilities) will immediately recognise the symptoms of having the instincts of an animal you possessed leaving an imprint on your mind. Stunk, Zel, and Kanchal end up slightly grossed out when they see a plate of escargot and butter-fried shrimps, while Crim has a messy accident in his shorts when he sees a bowl of fish roe.
- The Reviewers' lewd public articles attract the attention of Uly the legendary heroine, who is none to happy about them due to her religious nature. Thankfully, she stays her hand when she finds out Crim is a part of them, grudgingly accepting it as Heaven's Will if a literal angel is among them. It's also shown that the Succu-girl brothels are actually allowed to operate with Heaven's blessing, as the Goddess wanted to foster interspecies harmony through love and lust, with the love coming in the form of the Wedding Miracle demonstrated in chapter 28, where interspecies couples getting married become compatible with each other.
- Chapter 37 reveals that while succu-girls are allowed to operate in their districts, the Church insists that they keep their business inside said succubus districts. Meidri is naturally and understandably upset when she catches Demia's clone giving Crim a rather ribald wake-up call first thing in the morning, and she scolds the clones, telling them not to do such things inside Ye Pubbe. Furthermore, Demia learns through her clones about the truth of the Church's divine miracles being performed by angels delegated to carry out such duties by the Goddess, but as such matters are sensitive for the Church, she has to keep the truth to herself.
- A supplementary chapter mentions that since the light spirits in their brothel are so bright that it's hard to see, it's possible to accidentally step into... uh, stuff... that one probably wouldn't want to. Light spirits are cheerful and laid-back to the point that they don't bother with cleaning the place... or themselves.
- Chapter 40 shows that the Reviewers have been so successful at monetizing their reviewing efforts that they've been able to eat well and not have to take on quests out of town for a few weeks; this slower pace of living has led to Stunk putting on some weight, much to his chagrin, as one of the succu-girls he frequents tells him. Brooz and Urigo frequent a gym in the Succubus District, so they've had less issues with getting out of shape. A pair of birdmaids that exercise at said gym also mention that sometimes horny people wander into it just looking for sex without the desire to actually work out, since it is inside the succubus district and supports post-workout 'extras'.
