I Think My Dog Is Gay

I really wanted a dog, a tough dog that i can keep in front of tha apartment. SO About a month ago I brought home a pitbull from the humane's society, he was really mellow but they told me when he grows a lil he will start getting more agressive n sh*%. well, that hasnt happened. as a matter of fact, he's actually really soft and sweet, and certain of his behaviors have given me clues that make me think he is gay. one night i was tryin to go to sleep and he started barking by my door so i let him in. what does he do? he jumped under tha covers with me and started licking and biting my draws like he was tryin to pull them down. i thought that was weird. and so the other day i was walking him right and there was this dog, a little chiwawa dog that he started sniffin his ass and sh*%. well he keeps doing it everytime he sees this dog and i am putting 2 and 2 together and I have come to the conclusion that i think he is just gay. can a dog be gay? it makes me mad because now my boys make fun of me n sh*% and i have a pitbull who is not tough at all like their image is suppose to be