I see no reason to think that we are radically different today in our basic
sexuality than we were in millenia past.  Glorification of female sexuality
and the female form in a fertility religion would be very powerful erotic
stimulus for men; in fact I would expect such a religious view to do quite
a lot to increase male sexual arousal when viewing the female form.  If the
statues were created by women to glorify reproduction as part of a
fertility religion, that would likely make the statues an -extremely
powerful- erotic stimulus for men.  In fact if you're going to have a
fertility cult that worships female sexuality, encouraging male sexual
arousal in this manner might well be a crucial part of the religion, and
very much encouraged.

As I say I do not necessarily suggest that the statues as a form of
portable erotica is the only reasonable theory, or even the one I am most
attached to.  I simply think it's naive to scoff at the idea.  It may or
may not be right, but it's not silly.