There are 20 -48 parts to a bra. That's a lot of engineering in a small package. Shows how important breasts are to both sexes. I say that because woman stare just as much as men at the competition. Switching places, I would probably do my best to get attention and make the right man visibly uncomfortable.
Men know about the inner battle women have with their breasts. 70% sounds about right. It's just a sad given.