Try this, to enhance ejaculation, at the moment or orgasm reach between the legs of the doggystyle freak and grab her testicles.
Have the testicles cradled between index middle and rig finger, like two tomatoes.
Then squeeze, pull down and twist in one motion......
got that, squeeze, pull and twist.....(the latter is the same motion as a tennis topspin forehand.)
"YAROOSH - unhand my cobblers' ........she will shriek. And his anal sphincter will tense, thereby enhancing your sensitivity.