I'm a slasher at heart. I've played females, but I've found that for the most part I enjoy playing males more. I feel like I can get a better grasp on the character, which I realize sounds kinda crazy given that I'm female. I think with female character I don't feel challenged enough. Maybe. With a male I have to think how a man would think and maybe that's the challenge.
As for why I slash, I do it because I like it. End of story. We each do what we like and that's the way it should be.