the act of rotating ones penis, thereby emulating that of the blades of a helicopter.

The helicopter is a sexual position wherein the receiving party remains perfectly still while the giving party spins around in a complete circle, while remaining inserted.

The act of pulling your dick out of your pants and twirling it around in public. Can be performed with or without hands.

when you slap your penis round a womans face

A type of rotorcraft in which lift and thrust are supplied by one or more engine driven rotors

the helicopter is a crazy ass sex position that should only be attempted with supervision of highly trained experts of the sex art. unless you're the expert.
The male is suspended in air my a rope that should be quite comfortable or you may be rope burned in unpleasant areas. the man is then spun to speeds of atleast 60 rpm (a single rotation per second)
the female is then supposed to be laid on a table, stool, etc. the male is than lowered and inserted into the females vagina. the sex position is finished when:
1) The male orgasms
2) The female orgasms
3) The male vomits

CAUTION: if this act of pleasure has any error in the process you may be inaccurate and piledrive a hole right through her belly button.

While the man is on top of a woman in a missionary type position, he lifts her legs which are extended, and moves them around at various 90 degree angles while doing her. The purpose is to have the man's penis feel big inside her and the movement of her legs will make her orgasm faster.