Kitty -- there's really no way to have an easy discussion about this topic. So, you have to simply discuss the mechanics of what's going on and how masturbation plays a part in his problem. And then you have to ask him how he feels about cutting back or eliminating masturbation. Elimination is really what you want. But unless he wants it too it isn't going to happen. And that will result in him lying about it which only makes things worse. And RE guys tend to lie a lot about this stuff.
I also think discussing how destroying trust is no way to build a solid relationship. Lying about something as initimate as sex is a sure way to destroy everything. And you have to get that across to your BF.
I can understand how the reliance on fantasy would ultimately be disturbing. You want sex with your BF and you want him to be having sex with you. You want that emotional and physical connection. I think that is ultimately what every woman wants with the man that they love. Sex can be many things -- fun, exciting, a distraction, an escape... or, the expression of love between two people. RE tends to wreck that last one pretty well because of the struggle that sex presents just to get the mechanics down. People who have never had sexual problems have no idea how lucky they are.
I'd say to send him here to read but if he's a really sensitive person, these threads could really mess him up for a while. There isn't a lot of positive information and unless he has someone to talk to or access to studies, he could wind up very depressed. And RE guys tend to have some emotional problems to begin with. The ones that post here are IMO, among the stronger men on the planet because they are willing to face their situation and try to improve it, usually on their own. It took my husband a long time to be able to face the truth and to begin to research it on his own. So starting at this place (while the most thorough and informative of all places) could actually do some short-term damage. When he's farther along, here's a great place to send him.
and, Hi D! Glad to see you back with us. From your description, I wonder if you're dating my husband!!

Something I'm noticing in working together on this problem is that it is a "one step forward, two steps back" kind of thing. OK. Maybe it isn't two back but it feels like it because of the wallop that the step back packs. You, like me, want reality though. So, we have to suffer those painful reminders.
I recently realized that I'm reaching my limit on putting up with the ridiculous behavior that surrounds RE. And, I told him so. Whatever his problems are, he needs to deal with them. This hit him pretty hard but that's another part of reality that he needs to deal with. We all have a limit to our capacity to deal and mine is being reached. He either makes a concerted effort or we're going to have to discuss alternate arrangements. I'm sick and tired of lies and excuses. You used the word "confusion" and that's exactly it. He leaves me confused and I am very uncomfortable with that experience. The erosion to our trust has been significant and the way that this thing makes me question what I know and don't know about everything (our relationship, who he really is) is unacceptable to me.
The surprising thing is that he doesn't seem to trust me, either. When I tell him I'm OK with something sexually, he can't seem to allow himself to believe it so he interprets it that I'm only doing it because he can't perform normally. It upset me to learn this. There are really two sides to this problem. One is that he doesn't trust me and thinks I'd lie. The other probably more significant one is that he must think that this stuff is so "weird" or abnormal that I couldn't possibly really want to do it. I think he has problems accepting his own sexual preferences. The sad thing is that there's nothing wrong with them. He's a normal guy. He just doesn't know it.
On the better side, we've had a lot of recent success since he's stopped masturbating. It kills me that he didn't do this sooner. He knew he was doing it too much and compulsively at that. I didn't. He totally removed porn from his life. And, he's seeing a medical doctor who seems to have a clue.
But the real problems with him are emotional. There's something in there he just won't let me see or know. But I know it is there.
I feel so guilty for being a hard ass on this but at what cost do we continue to coddle in an attempt to improve sex? I'm not going to be in a marriage where there is no trust. And I'm not going to settle for masturbation to completion as a rule. So if he knows things that I don't know, he's going to have to deal with them because I can't read his mind or his past. I cannot undo what has been done to him. I would take it all onto myself if I could, but I cannot. So it is up to him. And that's just being an adult, I think.
The positive thing is that he has thanked me for pushing him because we are finally seeing the kind of improvement that doesn't seem like a one-off. But the trust issues are going to probably take years to deal with.
Ultimately, I can't settle for a "don't ask, don't tell" kind of existence. I have got to know where I stand. That's my own hangup but that's what I need and I know it. 'Cause when you don't know, you might not even be in the same relationship with the other person because your perceptions are so different. I'm not sure what the point of not knowing where you stand is. Happiness that's false like that is so fragile. It is like you're deliberately setting yourself up for a fall.
Sometimes I wonder if I'm doing more damage than good. But then I see the progress he's made. I guess if he doesn't benefit with me in the end, he'll be able to use this with someone else who won't have to suffer through what I've suffered through. I know that's a weird thing to say by someone who is married but ultimately I want him to be happy. I love him with all of my heart. And maybe my only role here is to help him over this hurdle. I don't know. I'd like to think it is for more than this and that once we deal with these issues we'll drift into old age together. But maybe I'm afraid to hope for such a thing when so much is messed up right now.
I just want him to know that he is a great guy and there is nothing wrong with him. Whatever he thinks is wrong with himself is the only thing that is wrong. And that's just sad. Because he is a beautiful person.