finger sniff test
when I guy puts his finger in a woman's pussy and secretly checks to see how she smells
Ben put his index finger in Bettyann's pussy and quickly smelled it in a finger sniff test
Serge's Finger Sniff Test (SFST)
Craftily inserting a finger into a lady's vagina and sniffing it to see if the odour is acceptable for further exploration
I did the Serge's Finger Sniff Test (SFST) on her and it was ok so I went for it