It is difficult to assess the real prevalence of various fetishes and sexual practices. Certainly transsexual behaviour seems to be common as both fantasy and reality. I have written about this recently.
Another fetish which also implies that men and masculinity are under stress is the cuckold fetish. It is hard not to conclude that men are often sexualising an inevitable situation, given that there are now so few restraints on the behaviour of women, before or after marriage.