1. How readily they react to nipple stimulation. I don’t like having my nipples touched, it’s annoying and uncomfortable like having something gently pushed under your fingernails, but every woman I’ve been with could get revved up in a hurry with a little bit of hand-to-tit action.
2. Vaginas (not vulvas) are surprisingly complicated. I wasn’t expecting so much texture and shape in there. There’s bulgy bits and ridgey bits and it generally isn’t just a featureless squishy tube.
3. When my girlfriend was pregnant we took a prenatal course. I LEARNED SO MANY THINGS. One of the crazy ones was how after a woman gives birth if she even thinks about a baby her milk can start flowing. Aint that neat.