Just look at the difference between male and female Angler fish. >When a young, free-swimming male angler encounters a female, he latches onto her with his sha

Just look at the difference between male and female Angler fish. >When a young, free-swimming male angler encounters a female, he latches onto her with his sharp teeth. Over time, the male physically fuses with the female, connecting to her skin and bloodstream and losing his eyes and all his internal organs except the testes. https://www.nationalgeographic.com/animals/fish/group/anglerfish/ https://www.nationalgeographic.com/animals/fish/group/angler...