Sheikh Ahmad Kutty, a senior lecturer and Islamic scholar at the Islamic Institute of Toronto, Ontario, Canada, states: “In any case of seminal ejaculation one must perform ghusl (a complete bathing). This must be done whether ejaculation occurs while awake or asleep, or following sexual intercourse, masturbation, contemplation of sexual activity, or foreplay. But, I must rush to add that seminal ejaculation is different from the usual wetness a man or woman experiences during foreplay or excitement. The latter, if not accompanied by intense feeling of pleasure (orgasm) is called madhy or prostatic fluid. In the case of madhy, one is not obliged to perform ghusl. He or she need only to wash the genitals and make wudu’ (ablution).
If a woman experiences wetness while being excited or during foreplay, she is required to wash her private parts and perform wudu’; there is no need for ghusl unless it is accompanied by intense pleasure (orgasm).”