I don't think that watching porn and being a recovering alcoholic necessarily go hand in hand. I think it is 'normal' for men [and some women] to watch porn to some extent, and I have been in 3 serious relationships as well as some not-as-serious relationships and all the men viewed porn, and none of them had any problems with drinking except the one I'm with now. I do think that porn can be an issue if they are 'obsessed' with it or can't stop watching it even when they know it bothers you etc. In that sense I do think it can be an 'addiction' and that they can switch addictions from alcohol to porn just the same as from alcohol to anything else.
In the last relationship I was in, porn was a big issue because he would watch it all the time but wouldn't be very interested in a sexual relationship with me. He would also lie about it because he knew it bothered me but he couldn't stop. To be honest it wouldn't bother me if he viewed porn occassionally but also had a normal healthy sexual relationship with me [I do think that both things are healthy/normal] and didn't lie to me about it. Clearly we had other communication/honesty issues that extended beyond porn and the relationship did not work out. My current SO/fiance watches porn sometimes but he doesn't hide it and he is super into me sexually and so I have no problem with it. As far as jerking off with you right beside him . . . IMO if this was a one-time thing it wouldn't be a huge deal, I mean to be honest I sometimes have urges and wish to self-satisfy without necessarily involving my partner. But clearly in your case he is doing it regularly and while knowing it bothers you and THAT is a problem. To me it shows a lack of respect, an obsession, and probably an addiction. I'm sorry and I hope you can work this out or leave the relationship.