I think everyone worries about being a dynamo in the sex department. For many—especially the penis-carriers among us—the inability to offer up an all-night-waking-the-neighbors-fest of sexual ecstasy creates tons anxiety and concern. I blame movies, which paint a pretty picture because they are fantasies, not reality.
Taoists consider ejaculation to be a waste of valuable life force. To understand how ejaculation is a waste of men’s energy, consider the common complaint by women that their lover cums and immediately falls asleep. (For women, however, an orgasm is considerably less draining, and in the Taoist tradition menstruation is the primary waste of women’s energy. Many women would agree!)