The legal definition should be removed because the goal is not to make the recipient unconscious. Also, this is not something that people actually do, its a freaken joke, you feminazi.
But, if you were to do it, a donkey punch to the spine just above the ass would probably work better (and provoke fewer lawsuits) than a blow to the head, which might even relax the anus. This is because sacral nerve stimulation has been linked to sphincter contraction (in cats)- dont ask.
Now, if you really want to get some sphincter contraction, without the whole punching thing, you cover the recipient's nose and mouth with a hankerchief full of ground pepper or something that will make her cough (or just ask her to cough repeatedly). Coughing tightens the anus twice as much as voluntarily squeezing.
Donkey punching involves the male punching the sexual partner in the back of the head during anal or vaginal sex prior to orgasm, to provoke a shock causing the vaginal or anal muscles to contract around the male's penis.
The move can be prosecuted as sexual assault and even rape in the case of surprise anal penetration.
-"Ooooh, that feels so good!!! Isn't it love? ...Love? hello? Are you okay? .... aaaaaargh!!!! Love?? Wake up!!!! Aaaaaargh!!!"
First: deadly assault. A blow to the back of the head is can easily cause a severe or fatal brain stem injury; even no-holes-barred professional fights ban it.
Second: it is rape, pure and simple. The logic of this would be easily understood by any jury. The object and motivation of donkey punching is clear and unambiguous: it is to render the victim unconcious and thus incapable of saying "NO" to something the victim would ordinarily and vigorously object to.
Our office, given proper evidence would, with great eagerness and dertermination, prosecute a case such as this. The probablility of conviction would be virtually certain. Furthermore, we could convincingly argue that the perpetrator(s) are to be regarded as dangerous sex criminials and thus pose a clear community danger while awaiting trial. Few judges would deny our argument that the perpetrators should be imprisioned while awaiting trial.
In addition, there is ample precedence for conviction of those encouraging these crimes on seperate felony crimes of aiding and abetting a sexual assault. A viewing of Jody Foster's "The Accused", based on an actual rape conviction, should make this plain to people.
In the case of a prearranged or planned assault, an additional and more serious charge of conspiracy would be added to the indictment.