I see no problem with what you're doing Flameschick, just as long as the other people involved are all aware of this.
Personally, I enjoy being in a relationship. Obviously I still check out other girls, that's natural, but I never have and never will cheat on my gf. There is absolutely no reason too....she's gorgeous, nice, fun, smart, positive, and she doesn't hold back in the sack
If I messed this up, I'd be the biggest idiot in the world.
Can I ask you though, have you ever fallen for one of the guys you fool around with? If you found 1 guy, who had everything that the 3 guys you're with right now had, would you start a relationship with him, and ditch the others?