Penile fracture results from direct trauma to the erect penis. The classic scenario involves a couple having sexual relations with the female partner on top. In this scenario the penis accidentally comes out of the vagina and the female exerts her body weight downwards onto the penis. Other mechanisms that have been described include anal penetrative intercourse, aggressive masturbation and rolling over onto an erect penis during sleep. In certain ethnicities, the practice of "Taqaandan" (purposeful forceful bending of the erect penis during masturbation) can be the cause.