That's actually a really interesting question! :o I've thought about this before one time. I think I usually prefer male vocals...at least in most cases. I'm not 100% sure why, I guess they just are more fitting for the kind of music I like. Plus I want to say that a majority of popular songs are male vocalists vs. female vocalists...but I could be wrong. Just an observation, though.

If a song has female vocals, though, I don't complain. I guess it's more like, I don't really PREFER one or the other, I'm just USED TO one more than the other. Coincidence, I guess. xD