Caran - had you typed into Google "do animals enjoy mating" you would have found the link to livescience yourself - together with various other options. Using the internet is not (always) rocket science ;)
I don't have the concept that men are always wanting sex and woman not so much. What I meant is in answer to the OP and that's about getting pleasure from it. Not many men needs rabbits.
Do animals, including humans, do anything from which they get no pleasure? The pleasure may be delayed, in the case of thinking animals, but there's always pleasure at the end of it eg, you may not get short-term pleasure from going to the dentist but you know you'll be better off in the long run.