Lox, I think you're being creative man.......The jerk part comes from the motion as do many other terms related to masturbation....whip the Bishop, tamp your tool, bop your baloney, slam your sausage, etc.

And RB.....No Jills.........I think we use jackoff in a bit more nasty way than you use wanker. Except between friends, calling someone a jackoff has nothing nice about it. If we refer to a woman with the same animosity we would probably us twat or cunt.

Spaw