I don't know why exhibitionism needs to degrade in the first place. Afaik there are no negative consequences to gaining exhibitionism experience, so there's no reason why you'd ever want it to go down. So it just seems like a chore to have to micromanage it, especially at the current rate. Unless you sit there and grind exhibitionism points, it's pretty easy to lose points faster than you can gain them from just occasional exhibitionism experiences.
It would make far more sense for you to lose alcohol tolerance over time, but that stat does not degrade.