The Ideal Heterosexual Couple

I'm a voyeur and I've paid good money just to watch couples have sex. To me the ideal benchmark is a tall slim athletic male in his late teens to early 20's and a curvy female in her 30's with full round ass hips and thighs. The only caveat is the male must have broader shoulders than the female and the female must have bigger and wider ass, hips and thighs than the male. This is just natural selection. Does anyone else agree?