I agree that there are other factors which break symmetry. Another potential factor is one I am well familiar with: in certain environments (such as math graduate school) there are a lot more men than women, so it is harder for a man to find women sharing the same interests than vice versa.
(This does not, incidentally, cause any of the men involved to lower their standards appreciably: the socially awkward and/or unattractive women are still single.)
I agree that there are other factors which break symmetry. Another potential factor is one I am well familiar with: in certain environments (such as math graduate school) there are a lot more men than women, so it is harder for a man to find women sharing the same interests than vice versa.
(This does not, incidentally, cause any of the men involved to lower their standards appreciably: the socially awkward and/or unattractive women are still single.)