呂洞賓
One of most popular of Lü Dongbin's legends is his encounter with a prostitute named White Peony (Bai Mudan). The most popular version comes from the Journey to the East novel. It is said that the immortal Lü Dongbin was greatly attracted to White Peony, one of the most beautiful courtesans in Luoyang. Lü Dongbin slept with her many times but never ejaculated, because he didn't want to lose his Yang essence.