Most of the discussion is with reference to gay men; why is it that is seems to be only the men who are uncomfortable with dancing with their own sex than women ?
I suppose that it's the 'handbag' thing; women are used to dancing with their friends, and see the dance as just a dance. Men on the other hand tend to only dance with women that they want to get into bed with {I'm talking 'club/disco' dancing, not 'ceroc',... although

..}
Thinking more... a lot of dance is about flirting with your partner - if you feel 'uncomfortable' (subjective term) with your partner, then a lot of the style and moves that you would normally put in to flirt would be absent.
Myself, I would see a gay man who is dancing as a follower in the same light as any follower.