a motion in which a guy jacks off.

the act of holding-hands
mostly the girl is the warmth but it could work both ways

Fingering or giving a hand job to someone by putting your hand down the back of their pants while they are sitting, far enough to where the hand extends to or beyond the crotch on the other side.

When one takes both hands and fists two different girls in the asshole.

masturbation, sturbing, jerkin it, whackin it, strokin it, pumping the super soaker, chokin the chicken, spankin the monkey

The act of ejaculating in ones hand, then open hand slapping your partner with the same hand.

A little known sexual technique in which a man gets down on all fours while his partner (man or woman) proceeds to stroke his penis from behind in a downward motion similar to milking a cow while simultaneously fisting the man on all fours.