Can not stop...: Ejaculating semen at reaching orgasm is impossible sine it is physiologically un-inhibitory. Manually compressing urethra at such moment so to prevent shooting semen is against the natural flow of ejaculation naturally resulting in variable back-up pressure about urethral compression which is related with personal semen volume and urethral distensibility. So, watch, wait, & see; don't do it again.
Answered 6/12/2016
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A doctor has provided 1 answer
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