Sorry, I am new around here and been playing this game for like 2 days or so. I will agree to i that it's one of the more complex sex games I have stumbled upon in the last years but I got just 2 comments.
First, it's a bit repetitive, as you have to do the same things over and over again and they will not vary by a single bit. Let's say you get one of the characters to the point of having sex with her. Nice, but while I can understand it will lower her lust, I don't understand why lowering the lust means that she completely got her memory erased like a robot, and doesn't remember what she did 2h before. That's beyond me. I mean 2h before you were having sex and "now" mentioning her tits gets her angry? WTF... It's ilogical. No real life girl you just had sex with would mind about it, if the sex was good. I could understand getting angry about doing it with another girl on the same day, or flirting with another girl while she's around... that could be reasonable. I could even understand that kissing her or anything else like fondling or so, happens somewhere where the rest can't see, but I can't understand why you have to do the maneuvers to raise her lust again, and you get the same fail checks.
Second, while it's nice you get the contests to increase love/affection of the girls, I would say it should also increase their lust being chosen over the rest, and not only that but also it's a bit annoying that only some of them would offer some sort of reward afterwards as it tends to favor picking only those. Maybe "some sort of" or even a smaller reward should be given to the side and even some of the main characters?