Dogs go crazy when they smell a female, not necessarily in heat. My ex had a female wolf-dog puppy (not in heat, but it hadn't been fixed yet). We had a party and somebody brought their male terrier (little dog). It spent the entire night trying to have sex with the big wolf-dog pup. The poor wolf-dog pup was covered in doggy cum.
Humans get horny too by the smell (the endorphins, or whatever), also the sight of a woman.
Or maybe just because they've been thinking about sex all day.
Mostly, it's the intimacy, the love that makes it pleasurable. Do animals love their mate?
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