I have been with my old lady for 10 years. In the beginning it was very, very detrimental. Jealousy was an insanely huge factor. Now that the honeymoon years are over, it's very, very beneficial. It keeps me from cheating, that's for sure! (I'm one who believes looking at porn isn't cheating) And it sure is nice, I must say. I don't have to try as hard to hide the porn.
Man, if they had this shit when I was younger...I would have probably turned out to be a totally different person.