I have a problem with all the girls I date.. Before I have sex with them I'm really into them and care about them and don't want to mess anything up, then we have sex and I lose all interest. Usually after the 1st time we have sex, it's hard for me to maintain an erection during other sexual encounters. So typically they realize I show no emotion towards them and break up with me after a month or two. I'm not trying to treat girls badly, I do respect them but I can't get over this problem.. For a recent example: Met a very good looking, nice girl 3 months ago. Everytime we went out, we had a blast. She's easy to talk to, has a good sense of humor and is fun. Well, we had sex 2 weeks ago for the first time and since then I haven't cared if I get to see her and have no feelings for her. It's like this everytime.