the act of lifting ones partner into the air so that they can fellate them, and as they fellate them, you "bench press" them in the air to move the genitals in and out of their mouth
When you and your three closest male friendssit on a bench and jerk each other off at the same time. The first one to cum is gay. Giving you a benchmark of who is the gayest.
"I'm not gay and I'll prove it. There is a bench over there, lest do the bench test."