Dancing in African cultures focuses on the pelvis area because that is seen as the spiritual centre of the body (which it is... life and pleasure come from there) - it isn't necessary sexual, for God's sake. It is a skill to isolate and move that area. It is an area that is not the focus of European-based dances. So in typical ethnocentric fashion, those of European descent assume that African dancing is "sexual" and because sexual = bad, unless expressed under tight controls or in a way they deem is OK, African dancing is "bad." It's absolutely racist. Then African dancing is denigrated as "booty shaking" and banned or subject to controls... but dancing of European-based people will poach and modify African moves with impunity, and after they get mainstream enough, suddenly they're fine and Europeans will even claim to be experts in it.

It's just dancing. It isn't a reflection on peoples' morals or character or sex lives or behaviour. It's a positive enjoyment of your own body and the body of others and a way to keep healthy and fit and like yourself. Why the hell would you punish anyone for it?
Get used to me. Black, confident, cocky; my name, not yours; my religion, not yours; my goals, my own; get used to me. -Muhammad Ali