I think it's a generally accepted fact fact that ladies are the fairer sex and that is certainly reflected in the number of photos of men vs women on dA.
Maybe being a red blooded chap blinkers me to the few shots of men there are?
Certainly the photos have to be of a higher quality or more unusual or interesting to grab my attention. Maybe it means that I'm more able to judge the photo itself and not just the pretty face featured in it even.