Nobody knows: Nobody knows, as we don't do research on pre-ejaculate (how would you collect it from 100 guys). Also, it doesn't matter, because life's rules don't change... meaning a couple would do a home pregnancy test if worried anyway (do it 3 weeks after sexual activity). In general, we think about sperm getting to an egg only if the penis was inside the vagina, without contraception of some kind.
Answered 6/23/2019
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