mangle
A variation of the sexual "triangle" position in which two females simultaneously position themselves facing each other over a prostrate man's face and penis while kissing, the mangle is a similar triangle formed instead by three males.  The term "mangle" is short for "man triangle".  The male lying prostrate is referred to as the hypotenuse.  A participant in the mangle is a mangler.
"Due to Andy's short height, he was the hypotenuse in an acute isosceles mangle last night."