Well, there *is* a shortage of male dancers outside of Africa... but that doesn't mean that all dancers are women, either. (Nor that all men who play djembe are egotistical and super-competitive.

)
I do think that a mix of men and women - in terms of both musicians and dancers - tends toward a more mellow feeling. but it all depends on the people involved, really. My teacher is a fine drummer but very laid-back, and most of the male students who've stuck around seem to emulate him. The guys will sometimes compete a bit, but in a very friendly way, and it's fun.
I honestly just enjoy playing music with other people, and since i gravitate toward bass djembe and duns, I'm not in a position to "compete" anyway.