Women generally have an easier time achieving cllmaxs clitorally, but with some practice you can achieve vaginal cllmaxs. Doing Kegel exercises can help. Kegel exercises strengthen the pubococcygeus muscle – the muscle used to stop the flow during urination. Once you have located the muscle, simply tighten for 2 seconds, then release. Repeat 5 times. Do this 2-3 times a day.
You can also use devices such as the Kegelmaster 2000, Kegelcisor, or Isis to strengthen the PC muscle. You'll find them here: http://www.evesgarden.com/transformnow