It's probably due to remnants of semen that dry at your urethral meatus (me-AY-tus) – the opening at the end of your penis. If there's a flake of dried semen stuck to the skin there, it will break the urine stream and cause it to go in all sorts of directions.
What do you think about when you masturbate or have sex? Would you tell your significant other if they asked?
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