The legendary "Wolve Grab" is a sexual practice which is not commonly used and known.
Prerequisite for this sexual act is the 'doggy style' position.
Partner X performing from behind (anal or vaginal)stucks two fingers up his partners throat so that he or she starts to choke.It will follow a contraction on any of those two ring muscles(anus-vagina). Partner X will experience high pressure on his penis. This can be repeated until the ejaculation is achieved.
I never realy heard somebody who did the Wolve Grab except of myself ...