I thought that the immune system would not see them as threats.
In: Biology
The safest setting for the immune system is to attack everything that isn’t your own body. As soon as you let something through, something else similar can get through.
The thing about sperm is that it’s put there on purpose, and men are able to simply use enough sperm to overwhelm the system. This also has the benefit, such as it is, of selecting for men who can produce a lot of sperm.
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