Pompoir (also known as "playing the flute", and "the Singapore grip" ) is a sexual technique in which the woman uses her vaginal muscles to stimulate the man's penis. Both partners remain still, and the woman strokes the man's erection by rhythmic, rippling pulses of the pubococcygeus muscles, so this practice is best performed in a woman on top position. Performing Kegel or pelvic floor exercises can increase a woman's skill in Pompoir by strengthening the relevant muscles, and allow her to identify, and isolate individual muscles, to contract them in turn to provide the rippling sensation. © Wikipedia