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What's some sex ed info you didn't know until embarrasingly late?
(lemmy.dbzer0.com)
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Depends on how empty and clean the tubes are before they get busy.
If the paramour is a popular lad and has multiple callers (or just a frequent self-pleasure constitutional), the operating environment may not be a sterile field free from DNA.
It's interesting from a biology perspective, but still good advice to give those teenagers who spend their weekends going at it until they can't pronounce their own names.