Hi...I haven't been here in a while...hmm...I think, urinating after orgasm is a natural body function to clear-out the semen... Not so sure with that, though...
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"Do your best so that you won't regret anything."
That only happens to me when I kinda felt like I had to pee before engaging in sex (well masturbation anyway). It's been said that its actually a good thing to urinate after ejaculation since its a way to flush the excess semen out.