1. Yes I realize no mention of aliens was made by you. That also wasn't what i said, but keep thinking that if it helps.
2. Body armor is worn quite regularly in hand to hand combat without weapons. Breast protection for women, head gear, athletic cups..all rather normal in combat sports.
3. Sexfighting and titfighting are people fucking, women groping or women rubbing breasts together. How these activities equal to punching and kicking in terms of violence is beyond me.
4. If I was selling nude boxing I suppose my corporate line would be that it is natural too

And I am sure with enough money it might seem natural to its participants too. Speaking for myself I can't say I ever felt my fights in the real world would have improved being naked.