Polly needs time to trust and decide what she wants. Right now it would be too forceful and in the real world hurt her in long run
That is one of the things some people complain about (in my opinion foolishly) but I think is nice in what Moonbox is doing. Let things take the time they need. Allie (nana) is going to take some time same as Polly, they might cave for a carnal act but their character would then rebel later at the long term relationship. But people like Veena, Sandra or Karen want the sudden relationship so could be in one encounter.
lol and then there is the cult of el pene de diablo they only needed a glance ;). But like I was saying even though it is an AVN/porn game I like the fact that things take the time they need to not feel overly rushed