Angler Fish

The female Angler Fish possesses the glowing 'fishing rod' that it uses to lure prey in the dark. The male however is only about 1/20th the size of the female. It attaches itself to his horrific goddess by burrowing its teeth, the female then 'feeds' him ex-utero style until eventually he loses his eyeballs, internal organs and finally his life. By then, she'll already have his sperm so it doesn't matter.