Why does my dog do this!?

Omg, why is it that I can't give my dog lovins (belly rubs,snuggles) without him getting excited? He always tries to hump or go to sniff the crotch... It grosses me out. How do I stop that!? He will also do that to anyone that  walks through the door & it's embarrassing. 
I can't even set a baby on the floor without him going straight to sniff crotch. We're having a baby soon & it needs to stop. We tell him no & push him away when he does these things.
He's 1 & not neutered. Idk if that makes a difference. 

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