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So it has intimate time, considering its art style, l wouldn't mind if it had no actual sex(sex happens but not 100% shown but still is cute). After all, with this social simulator what it matters is what you do with other people, their interactions, their company not sex like a vulture hanging around for the meat. Still good to have a "pseudo" intimate time.
Though yes, Artificial Academy 2 actually managed all that with sex but both can be improved to put emphasis on its interaction potential(and intimate time). Its freedom of choice, like doing only anal and the girl mentions it is what is needed. The attention to detail. You must play it if you wish to learn more. Though its simple in act(only few lines), the concept is there and never seen before.
Imagine doing what you always wanted with your lover(non-erotic) and if you both really want to something erotic(even with a third too), do it stealthly(out of sight). Now that would be interaction, lot of examples exist.