Retrograde ejaculation occurs when semen which would, in most cases, be ejaculated via the urethra is redirected to the urinary bladder. Normally, the sphincter of the bladder contracts before ejaculation forcing the semen to exit via the urethra, the path of least resistance.
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Normally, a healthy adult male ejaculates one-half to one teaspoonful of semen during orgasm, but the amount varies widely. Whist standing, imaging you are passing urine and contract those muscles that will stop the flow of urine. The pain is severe.
These days, however, Flowmax or Uroxitrol are more often prescribed. This typically causes urine to be cloudy. Leaking semen when aroused or simply having sexual thoughts is normal for many young men.