I love the smell of my wife's panties, and I've used them to get off before when she wasn't home.
I guess I don't get how some guys say their wives would be mad if they found out about them sniffing their own wives' panties.
My wife likes the fact that I like to sniff them, to her it's reassurance that her scent turns me on. I haven't ever sniffed anyone else's (at least that I remember, probably mainly from lack of opportunity), but it's great sniffing hers.