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Happy reptile noises.
For whatever reason sperm cells just come out better when kept a couple degrees colder, though, so here we are with our insides out.
Yeah its the prime example that evolution isn't perfect just happy with good enough.
Also a great detriment to the "grand design"
It also illustrates a funny bit of the logic of multicellular non-clonal creatures: the germ line is the species. The other 99.9...% of you is just a fancy delivery mechanism, so it makes sense to add something seemingly super impractical to the anatomy if it slightly helps the sex cells.