From the comments

Natasha C. writes:

I have not seen this mentioned in any comments (or Tyler's post) but consider this: there are at least some men who would support the idea of cloning themselves, I doubt there are many women who would do so. Are men more narcissistic or is there something else at work?

One possibility is that men are more insecure about paternity than women are about maternity, and so they demand greater similarity.  The lower variance of female reproduction results is related to this, noting that the would-be male cloners are outliers of some kind rather than the median.  What other explanations can you think of?