I will state this as delicately as possible and hope that my meaning is not obfuscated by the delicacy.

Is it possible, even remotely, that the reason that females seem to disproportionally chosen is that upon the viewing of the nude scan it is entirely less likely that a secondary would be necessary to resolve an anomaly since the area in and around the genital area as it is less obstructed from detection of something that needs to be checked further? In other words, cavities excluded, there is less stuff to hide stuff behind and under, so they are picking people they can easily clear and not have to do the resolution pat down.

I may be totally off base, but combined with the "Hottie Alert" effect, it could add to the difference.