I personally think that people with that addiction do not and have not found someone "worthy" enough to satisfy them mentally, psychologically and intellectually enough to keep them from being driven to want more than "just sex." I don't think they see anyone fit enough to teach them or entice them to want to realize that there are intelligent people in the world if you just look. Also it probably is a low self-esteem. Nothing to actually share which leads to only finding instant stimulation which is fornication, to some, "the next best thing." I don't really know, you tell me.