My boyfriend is obsessed with sniffing my ass?

The first time he done it, I thought it was my imagination. Then he begun going down and taking long deep sniffs which turned him on like I have never seen him before.

Sometimes I will just be lying there and he will go down and start smelling my ass, it's like some form of foreplay to him as after that he wants to have sex. During doggy, he will stop, bend to sniff/lick my ass then start sex in this position again.

Is this weird or normal?

Prolapse literally means "to fall out of place", from the Latin prolabi meaning "to fall out". In medicine, prolapse is a condition where organs, such as the uterus, fall down or slip out of place. It is used for organs protruding through the vagina or the rectum.