Today's New York Times has an article about the lack of men's participation in rhythmic gymnastics due its gendered associations:
The stigma of the term rhythmic gymnastics poses “a huge marketing challenge,” said Mario Lam, a martial arts and gymnastics instructor in Canada. Lam uses the term “martialgym” to help avoid the connotation that it is a female-only sport, he said.
Anyway, here's a clip from another sport that men have historically not participated in at the Olympic level (or any level? I haven't looked into it)--men's synchronized swimming.
Unfortunately it's impossible to find the whole SNL skit online (another NBC crime against the Olympics). Here's a snippet from it. It's amazing.