In Taoism, “single cultivation” occurs when a man masturbates, and instead of ejaculating his “jing,” his maleness is converted to “qi” (energy), and then absorbed into the spine and turned into “shen” (spiritual power). Masturbation with ejaculation is seen as something that will weaken the man, especially the kidneys which are considered the center of spiritual energy. A man could also “reverse orgasm,” which could be totally dangerous and cause infertility and other issues if semen is redirected to the urinary bladder. Usually this occurs with a medical issue, but Taoists have learned that stimulating the perineum with tons of pressure can make it seem like you didn’t orgasm at all. The ejaculate just comes out in your urine. Other philosophies that encourage orgasms without ejaculation for the sake of energy conservation are Karezza and certain kinds of Tantric masturbation.