There's no true equivalence, because the effect under discussion is a matter of magnitude. The simplest illustration I can think of is that there is a large mar

There's no true equivalence, because the effect under discussion is a matter of magnitude. The simplest illustration I can think of is that there is a large market for average-looking call girls, but only a small market for any-looking gigolos. There is no symmetry either between the extent to which men and women are motivated to pursue sex, or the extent to which they're receptive to it. It isn't to say that there is no demand/desire in the other direction (or direction(s) in the case of queer individuals), just that the other direction isn't the one that has a big impact or causes the common problems.