What is compulsive sexual Behavior???

Approach bias for erotic stimuli in heterosexual male college students who use pornography Journal of Behavioral Addictions
Can pornography be addictive An fMRI study of men seeking treatment for problematic pornography use bioRxiv
Tendencies toward Internet-pornography-use disorder Differences in men and women regarding attentional biases to pornographic
Brain Studies on Porn Users & Sex Addicts – Your Brain On Porn
Perceived addiction to Internet pornography and psychological distress: Examining relationships concurrently and over time. - P
Full article: Do Cyber Pornography Use Inventory-9 Scores Reflect Actual Compulsivity in Internet Pornography Use? Exploring th
s10508-018-1167-x.pdf

Most of these links are probably broken - if that is the case, you can just search for the titles in the links.

Porn addiction is not a medically recognized term although it has been proposed in the DSM-5 and the ICD-11 under the category of "Hypersexual Disorders." Compulsivity has a less rigorous definition that I don't know off the top of my head. I recommend doing your own independent research on this.