When a female and a male have sexual intercourse, the Lady (usually a very experienced whore, who has a background in gymnastics) the lady holds onto a ceiling fan; spreads her legs into a splits position. The man then lays back inserts the penis into the vagina and lays back while he gets the best sex he will ever have.

When you swing your penis around in a circle and make the noise of a helicopter.

The helicopter is a very difficult (and awkward, don't forget awkward) but fulfilling sexual position. It is performed by the man who, while fully erect and inside the woman (... or whatever.), proceeds to turn his entire body in a circle around the woman. All the while turning his penis inside the woman's vagina (... or whatever.).

Sexual act with the female on top. The female does a split and inserts lubed penis into vagina. The male then grabs hold of the female's legs and spins her around rapidly, similar to that of a helicopter's blades.
Has a high failure rate, roughly 100%. Failure results in Female either falling over or vomiting, and Male losing penis.
Theoretically, a successful helicopter, if done fast enough, could generate lift for the female for about 2 seconds. There have been 3 reported cases of success, but they were all in Japan so you never know.

When naked, a male moves up and down in a hula hoop motion, which causes the flacid penis to spin like a propellar. This act, although mainly done by children is also enjoyed by many men and their female audiences.

The act of twirling your penis in a circle, usually with the index finger and thumb around the base of the penis. After 6 or 7 revolutions, all the blood rushes to the head of the penis, and you are left with a very long, very skinny flacid penis.

when a man can take his flaccid penis in one hand and be long enough to have extra, which he rotates. This gives the propellor affect. This can also be done with no hands, but is a tad more difficult and for the advanced only, as it requires flexible hips.

A two lobed hocker connected by a thin stream of saliva.