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The male reproductive system is designed to ensure that it doesn't happen. The main reason it does not is because a muscle contracted called a sphincter that prevents the bladder from leaking any urine during ejaculation.

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10y ago
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11y ago

Yes, particularly if you just had sex. Since a man urinates and ejaculates out the same place, then if if a man just had sex, his starting stream of urine may contain sperm cells. It is also possible that straining to defecate can cause some semen to drip out, and such straining may also cause you to release a little urine.

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13y ago

The passage of urine stops when a man is about to ejaculate because the acids in the urine would kill the sperm cells. Pre-ejaculate coats the urethra from dangerous uric acids.

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Q: Why does urine stops when sperm starts to flow?
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