i guess i'm hopping in here a little late but i'll give my opinion anyways.
it sounds to me like you don't want/aren't ready for a serious relationship, as mentioned before. i've been in a "friends with benefits" situation and if you can both keep emotions out of the picture, it can be really fun. i had to break off mine because i felt she was getting attached and i didn't want to hurt her, she was a friend after all, we just happened to sleep together. lots of people in those types of relationships aren't actually friends, they're more like f**k buddies, but it really depends on the people and the situation. mine was pretty much like an open relationship without the emotional aspects. we would hang out, go to movies, have sex, etc. but we didn't expect any kind of relationship out of it, we were fine if the other person saw other people, we even took a break when she had a boyfriend for a while and got back "together" when they broke up. so i think, at least for now, that would be a good situation for you, so long as you make it clear from the start that you don't want a relationship.
since this isn't an exclusive relationship, make sure you use protection, you don't want an STD. if you start something like that, make sure you always have some condoms with you because guys aren't always responsible (imagine that) and don't always have them, even if they're planning on having sex. so be safe and have fun.