In his recent book,

"The New Male Sexuality (Bantam Books, 1992), psychologist Bernie Zilbergeld, Ph.D., claims that many of his male patients who practiced pelvic-muscle contractions over time reported increased sexual sensation and more intense orgasms. That's not all. Over the past 20 years, William Hartman, Ph.D., and Marilyn Fithian, Ph.D., co-directors of the Center for Marital and Sexual Studies in Long Beach, California, have prescribed Kegel exercises to more than 1,300 male patients who were troubled by erection problems. Most of the men who did the exercises as prescribed reported firmer erections than before.