This seems to be a promising start, and I'm interested to see where you take this. One thing I would ask for is some way to level sexual skills without actually having sex - as it is, I can get to the weekly cap of 20 skill increases fairly easily, but that still means disappointing my partners a few times because I'm starting from zero. Affinity isn't too hard to get back up, especially when you've got far enough to have sex, but at this point I've had sex multiple times and haven't got a single girl to climax yet.
Another point would be that I'm a sucker for a good paper doll system and I would love to see some more visuals in the game, but I understand that that would be a big addition and if you want to keep it text based that's up to you.