Don’t know about birds, but you’re wrong in that mammals enjoy sex. Humans do sure, and so do a couple other species, like dolphins, and I think chimps, maybe a couple more, but that’s about it. Cats for example have tiny hooks on their dicks, so when they insert it into a female cat, the hooks get stuck, and she can’t run away. For most animals, reproduction is a nasty business, not a pleasuring activity.
Most birds don’t have external sexual organs (males of some breeds have penises, but most don’t). Both sexes have a single “vent” – the male bird mounts the female and they align their vents for sperm transfer to the female. Behaviour indicates that they experience pleasure in mating, and some breeds of birds also mastubate.
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