I define sexual understimulation as when you aren't having the right kinds of sexual activity. This condition can be a co-morbidity with clinical depression. If you're sexually understimulated then everything is going to seem erotic to you. And that can be a problem:
If you are sex negative then you'll support any authoritarian regime that will make the depravity surrounding you stop. If you are sex positive then you'll think everything is an invitation to be lewd and exhibitionist. Obviously both of these extremist views are really bad and can lead to a person developing really weird fetishes. Like all extremist ideologies, one side drives people into supporting the other.
I think the solution to this problem is to find a sense of empathy for others, an altruistic purpose in life, and erotica/porn that is right for you.