It just occurred to me why I get a headache whenever I stumble upon sexually arousing material. It seems that both sexual arousal and migraines are associated with low serotonin levels [1]. When you get aroused serotonin drops and headaches appear. Maybe because of the reboot process my serotonin levels are unnaturally low already and every small arousal takes them below some threshold where headaches arise. Good thing exercise, among other things, increases serotonin.

Would it be plausible a longer cycle? Something that is easily up to a few months longs. Governed by Serotonin. With Serotonin growing slowly as a person is celibate, until it leads to spontaneous orgasms (but not emissions). At that point the system is unstable, and a person often stops being celibate. This leads to masturbation. Which either lowers serotonin, or lowers perceived serotonin (with a system similar to what we know so well about Dopamine). As Serotonin is now lower, a person becomes more impulsive, and masturbates more.