Assertion: semen's sperm cell | /r/HasProperty | good at tunnelling
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text: The standard line about where the sperm goes that's blocked from exiting the body is that it "bounces around and is harmlessly absorbed", but sperm cells are good at tunnelling, and I guess inevitably they get somewhere your immune system can detect them, and as they have different genetics from your normal body cells, they can provoke an immune reaction.