Masks during sex? Sounds like a ploy to hide ugly women during sex or reduce sexual satisfaction for women.

(We concentrate on your face guys, it has very little to do with other body parts. Even in porn, you can see that is where she is looking, well that and shoulders. Built shoulders is definitely where it is at! Oh and do squats at home with light weights in front of the tv to built a great butt no matter how old you are, but I digress!)