Vertical Rhinoceros
When two fully erect men lay on their backs, scissor their legs together until their balls touch, and a woman mouts both penises allowing for simutaneous penitration of the anus and vagina.
"I'll tell you Michael, there is no one I would rather Vertical Rhinoceros my wife with."
"I agree, your smooth shaved balls rubbing against mine really add to the experience, John."
"I agree, your smooth shaved balls rubbing against mine really add to the experience, John."