I'm confused about doctors who say that we have to masturbate and that semen is not reabsorbed if we don't ejaculate. is it harmful not to masturbate?

See below: There is much misinformation and myth regarding masturbation and its reported "health" benefits or detriments. While once commonly thought of as taboo or a sexual perversion, now generally regarded as a normal, healthy sexual activity practiced my most that can be pleasant, fulfilling, tension-relieving, acceptable, and safe. Conversely, there is "no" harm in those who choose not to masturbate.