Do the Decent Thing
A phrase that can be heard above the screams and the grunts of 'men only' establishments such as conservative clubs and roman baths. It is customary in such dens of rampant homosexuality that, should a gentleman be kind enough to let you make brown love with him, during the act you should repay his generosity with a reach around.
Come on Tarquin, I've let you into my pooey palace of pleasure, now do the decent thing and grab hold of my todger!