tonguing phobia
One cannot open one's mouth when one is being kissed by a member of the opposite sex, even when the person trying to kiss the individual has their tongue in one's mouth (so to speak).
Blondieblueyes tried to kiss Lurch this one time at band camp, and Lurch wouldn't open his mouth..no matter how hard Blondieblueyes tried. SHE EVEN PUT HER HAND ON HIS FACE!