is it true that the only other mammal to have intercourse for pleasure is a dolphin?

Question: is it true that the only other mammal to have intercourse for pleasure is a dolphin?
- Keywords:
  dolphin,
  mammal
Asked by harpermoore to Ed, Hayley, Jason, Nathan, Sophie on 21 Mar 2013.
- Sophie Holles answered on 21 Mar 2013:
  
  Well pigs have orgasms that last for half an hour, some bats give blow jobs, female bonobos have a sexual behaviour called gg rubbing where they rub their vaginas together, and I’ve seen monkeys playing with their penises.. I don’t think we can say for certain what an animal feels when it shows a behaviour, because we can’t ask them. But lots of animals have the hormone oxcytocin, the hormone we release when we feel sexual pleasure.

Question: is it true that the only other mammal to have intercourse for pleasure is a dolphin?