I use the word sex loosely. If you like someone, but you know other people are interested in him/her also, do you like the challenge of competing for their attention? I'm thinking situations like someone you know in real life, someone at a bar/club/party, or someone online. I've never liked a woman enough to want to throw myself in the ring and "win" her affection if there were other men pursuing her. It's only if I know she isn't interested in these other men that I would pursue her. If she is spending time entertaining other guys, then I figure she must be happy with that. Maybe I'm too nice to other men by not competing with them.