Why can't men knee on a bench?
One of the gay jokes is that you don't bend down to pick up the soap at communal shower. I would like to add that, you don't knee on the bench either like Rafael Nadal.
In this picture, Rafael Nadal knees on a bench during a practice session in Bremen at the Davis Cup World Group quarterfinal match between Germany and Spain.
(Image from AP Photo/Joerg Sarbach)