Hey everyone, just wanted to respond to the "is sex the end" thing: no!
In my opinion that's where the "real" fun starts.
That's why I'm not rushing towards it, it's not to try and milk anything, but I really like to create a game where there's a feeling of accomplisment, once you get to have sex with one of the girls.
From that point on the relationship can develop in so many interesting ways.
Think of it as a RL relationship, having sex for the first time is so exciting, but most of the time it's also (in my experience at least) not as good as it gets yet...
You get to know eachother better (sexually) and start exploring/discovering more and more, the longer you are together, the more fun you have!