I've probably had an equal number of men and women flirt with me, though I am into women and my appearance likely reflects that. Being openly into women while active in a fetish scene and going to gay bars more than anything might have had alot to do with that.
I'm male and I thiiiink men hit on me more, but I'm not usually in social settings with strangers, so any of that tends to happen very rarely. It's also totally probable that men have just happened to be less subtle than women, and I've had an easier time reading their cues because those cues are more obvious.
Although I am 100% straight, I have many friends that are otherwise. Most often I am hit on by men. I have had a few women friends that have told me that they are interested in me, if I ever change my mind. I take it as a compliment and we remain friends.