like the last girl wrote, in-between - meaning a little make-up. ya so many guys say that they want no make-up but how many girls have they seen with no make-up? there are very very few who look good with absolutely no make-up - let alone wear none - so they should just admit that they like a little make-up on most girls but like it so it LOOKS like they're wearing none or hardly any.
I think girls do really look best natural but for some cases a light make-up can look good too. it's not about what you have in your face and how much of it, it's how honest you are. like it or not but many guys like a girl to be gentle with her make-up, make it look natural. and I know how girls look without make-up, I have actually helped some girls with theirs or if you want they learned me more about it since I was curious.
but what about those pretty girls in movies and those hot pictures? yes... those are hot but desire can be so much more than just pure optic attraction, especially if the girl you fancy is not... just a poster on your wall^^
beauty is in the eye of the beholder. to me honesty and self consciousness are more beautiful than make-up can ever be.