what part of hte male reproductive system is responsible for preventing urine and semen exiting simultaneously

Question: someone said one of the functions of the prostate is to be a valve to prevent semen from backing up into the bladder during ejaculation. This doesn't sound accurate.
Answers:
The pubococcyl muscle (PC muscle) controls both erection control and the stop and start of urine flow.

Other Answers:
The sphincter.

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the prostate is the correct answer.

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