You know, this is a radical idea, but instead of picking apart the game, maybe just enjoy it for what it is meant to be, a slow burn.
There are plenty of games that go quick and fast for the sex, this game was never meant to be one of those. It's a slow game where you are meant to explore the environs and the burgeoning relationships with the girls.
To put it this way, when you go out to a restaurant, you order a meal from the menu, do you try to shovel the meal down in record time, or do you savour every bite, try to test everything that makes up the meal?
Because that's what is going on here - you're expecting a meal you can just shove your face into, when in actuality, it's a three course meal.