Comment by snickerbockers

There's this fascinating phenomenon called "micro chimerism"where somehow they've found that some of the cells in women's bodies are actually descendents of cells from past sexual partners, and they can be found in places far removed from the reproductive tract. the relation to your comment is that the tonsils and throat are known to be susceptible to this.

Fun rabbit hole, in since cases they think it's the result of cells from offspring winding up in the wrong side of the umbilical but there are also cases where there was never a pregnancy in which case it has to be wayward sperm but that's absolutely bizarre and far too orthogonal to the sperms primary objective.

And AFAIK they don't have any idea of why this is beneficial to the woman or even to the man who created the invasive cells.