When a puppy is so cute, it produces a physical trembling and severe increase in serotonin levels in the brain resulting in a holistic feeling similar to that of an orgasm.
That new puppy, Carrol, is so damn cuddly that when I pet her I get a puppygasm!
"Hey Andrew is that your new puppy"
"Yeah, you want to pet her?"
"YES!.....(30 seconds after petting)
Holy Shit this puppy is so damn cute, I think I just had a puppygasm!"