Can dogs have feel attraction towards other dogs?

Wouldn’t say it’s a major issue more-so a curiosity. But I have two dogs, a smaller, 9 year old chi mix and a younger Border Collie mix who just turned 1 year old. They relatively get along well together minus a few tiffs they’ve gotten into because my oldest dogs has displayed guarding issues with food. My oldest dog has always done this thing where he licks my younger dog on the mouth when he comes back in from outside. He’ll lick his whole mouth, jowls and try to get in his teeth as well. My younger dog just sits there and lets him do it 😂 lately though I have been noticing that not only has my older dog been trying to lick his mouth more often, but he has also resorted to attempting to lick his private parts and butt! And lately when my collie enters the room my oldest goes crazy! Like he starts whining and whining until he can come lick my dog! And when he does he is so happy. 🤣 I found it strange and I don’t allow him to lick our Collie often only because my dog needs to know that his space is equally as important as everyone else. Love is love and I don’t judge and granted, my collie is a veryyy handsome boy. He gets lots of compliments everytime we go on a walk! But I’m just curious, do dogs feel attraction to other dogs?