Because most are immature or embarrassed and so they use humor to skirt an awkward topic. Also, because their brain isn’t fully developed, they may laugh, which ironically is a nervous reaction sometimes, to lighten the mood or help them calm down when talking about uncomfortable or even taboo subjects.
Unexpected things can typically trigger a laugh response and since sex is generally considered taboo, especially for kids, it makes them laugh. Once it is no longer taboo it doesn’t trigger that response. For example, I have always been careful to use clinical terms for our body parts and my kids don’t even flinch when someone says “penis” (although I sometimes do because I was raised differently).
The leading question aside…
Part of it has to do with something being a social “taboo,” what with the high social stigma involved with sex. It’s an awkward transition to make if we always tell children and teenagers that sex is an adult thing, but still bring it up in their presence. The healthiest way to deal with that awkwardness is usually going to be a sense of humor, even if it sometimes seems out of place.
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