Rubbing her nose in it
I once slept with a girl that I met at the gym… she trained all the time and I asked her for a pair of her smelly used gym socks… she gave me a pair that stunk (like vinegar)… she thought I wanted them to sniff myself…
I took them home and pretended to take them off my feet… then playfully held them over my girlfriends face saying ‘do my socks smell?’ Laughing…. She laughed too, saying ‘ew they stink… get them away from me’….
I playfully held them over her mouth and nose ensuring she got a good taste of the smell…
Found it a huge turn on