And something I've noticed? Boys look back.
Over the past few years on occasion I've checked out girls on the street, just a quick appreciative glance. Nothing exceptional about that. But, pick a woman out of a crowd - chances are, nine times out of ten she's straight. Take that one out of ten, now - probably she has a girlfriend and is monogamous, or I'm not her type, or she assumes I'm straight, or she's having a bad day... what it comes down to is that women do not typically look back unless you are at the Dyke March or a women's play party or something.
The past few months, though, my idle desires have brought me to gaze in a friendly fashion upon men, and well, they look back. Usually just a return look and a smile, sometimes a nod or an eyebrow to go along with that. I don't imagine I would approach anyone on the street like that - but it's flattering to get some attention back.