Confidence is a very unpredictable and chaotic variable. It jumps up and down without any reason. Just for example: for working in the bar Sammy sometimes get [plus], [minus] or [no change] Confidence points.
In Monday Sammy can walk in the house without underwear, but in Tuesday she can't it but in Wednesday she can it again. It's a very chaotic and jumping system.
How about to make a new variable "Perversion" (for Lewd actions), like in "Third Crisis", walking without underwear make more perversion and the character can more walk without underwear.