“what species of animals have sex for pleasure” all of them. All of them. All of the species of animals that are capable of having sex do it for pleasure. Because a pleasure response is how an animal’s instinct gets it to have sex. “oh but all the other animals besides humans only do it for reproduction” really? Really. You think they’re planning that far ahead? Trying for babies on purpose? You think ducks and mice and bedbugs and eels and turtles and cows all KNOW that sex causes babies and totally want that all to happen and plan around it, even if they’re not feeling the pleasure, because they know it’s their duty to the future of their freakin’ family line? No. That is a human thing. Having sex not for pleasure is what differentiates humans from other animals, and it’s part of what SUCKS about us