You can not get pregnant by setting your clothing on fire.
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In fact, have no idea why someone might think you could get pregnant this way. Maybe they’d been watching too much science fiction and were imagining semen infested smoke curling up from a young man’s soiled pants and entering the womb of his lover?
Hmm… if I sold that plot to the right hentai director I bet I could make millions!
Explanation for why I’m bringing this up
Someone asked me if it was possible to get pregnant by pants burning. I suspect they mean dry humping, which we’ve already covered, but I am not completely certain. I suppose someone could think that “hot” sex involves fire…