" 'The only completely, fatalistically monogamous animal we've been able to identify is a tapeworm found in the intestines of fish,' Lipton tells WebMD. That's because the male and female worms fuse together at the abdomen and never separate afterward."
im not sure what would disturb me more:
a) being a tapeworm living in the intestines of a fish, or,
b) spending the rest of my life with the same worm.