Well, women want what other women have. Example: I didn't fancy a guy until someone else did, and then I realised that he was quite a catch.
My advice? Get a female friend (whom you trust) to go around making subtle comments like, "(insert name here) looked good today, didn't he?" or... "If I didn't have a boyfriend, I'd totally do (insert name here)". Thus, other women begin to see you as a sex object, and as a potential romantic liasion.
Trust me, whenever a friend of mine comments on how hot some guy is, I always start to 'see it' even if before I didn't.