How can i stop semen coming out while sleeping

I think you're saying that you've had nocturnal emissions on and off, and that you don't like the mess on your genitals.

Any male who is in puberty and not engaging in sexual activity will experience "wet dreams" about once every 14 days or so.

There's no real way to "stop semen coming out while sleeping."  There is the squeeze technique where you grab your penis and pinch the head closed, but that's painful, and basically only forces the semen back up into your bladder (retrograde ejaculation) which can be uncomfortable.

The majority of men masturbate because it feels good and gives them a release, and the chances of a wet dream are greatly reduced, but not totally eliminated.  If your culture doesn't support masturbation, then your only option is to find a sex partner, which may be just as frowned upon.

Good luck.

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