All "life dominating" difficulties feel enslaving to the people who struggle with them. Women who cut themselves or make themselves throw up feel enslaved to the problem. Guys who struggle with homosexual temptation feel enslaved to a problem they don't know how to combat.
Struggles with pornography are like these and many others. But porn is unique because it is, I suspect, much more prevalent. For guys struggling with porn, the enslaving elements are found in two areas. First, sexual sins have a unique ability to enslave (for biblical-theological reasons I don't have space to unpack here). Second, porn hides in the dark. When you combine the sexuality and the secrecy of porn you have an enslaving combination. This means one of the most important things guys can do to break its enslaving power is the one thing they often sense they cannot do—expose the darkness to the light. This is hard, but Jesus will empower you to do it when you ask him for his help.