I know mine does. He was also heavly into internet porn, which he tried to hide, but with me working in I.T.C he didnt hide it very well I told him that it was unfair that he was withholding sex from me but getting his pleasure from the internet, I was not impressed I have no problem with porn, and hes not using it instead, because now its stopped our sex life has not improved.
I myself Masturbate, but find it unfullfilling I want my partner to want me and its just not the same. It also makes me feel more unwanted that I am in a relationship and have to resort to self pleasuring