My friend’s rottie was obsessed with my crotch. And he had a habit of leaning against people to show affection, but he was a big boy so he would nearly knock you over if you weren’t prepared! I used to pet sit for her, and he would lie against the front door, so when I would come over I would have to shove the door hard to push him away from it while telling him it was just me. Sweet boy loved me and knew I was family, but he would have scared off any intruders just by his size. He let children treat him like a jungle gym though. He was so kind and so loyal. I’ve never known a dog quite like him.