Here's my thoughts, not an expert or a sex therapist or anything, just a guy calling it as I see it.
First of all, it sounds like you're happy with all the other aspects of the relationship and that you are happy together aside from the sex. This is good because it means if you can solve this problem, and I believe it most probably is solvable, you'll have an even more fantastic, lasting relationship.
Now, you really need to sit down and have a really long, thorough, mature discussion about the issue and about how things need to change, or at the very least efforts need to be made to change. The speaking to other women for sexual gratification is obviously a serious boundary that would be a deal-breaker for a lot of people. You said it almost was and he obviously felt bad about it and knew how much he'd hurt you. Has it happened since? Have you made it clear that whilst the daily porn and no sex is bearable, the talking to actual other women is too far and will ruin the relationship?
Okay, based on your description of your OH's behaviour and past, it sounds to me like he's a) almost definitely addicted to porn and b) as a result has conditioned himself to only be able to get off via porn, rather than actual physical sex. The arguments with his previous partner has obvioulsly aggravated this condition further, and, combined with his fear of bodily fluids has all contributed to his lack of interest in sex with you.
So, what to do? Well, my advice would be, first don't give up! Like I said if all the other aspects of the relationship are great then it's worth at least another shot and would be a real shame (and another blow to your OH's condition) to end it all. Start shaving your legs again, put on your make-up, put on some lingerie - make yourself feel good and feel sexy. It'll be hard for him to see you as sexy if you've given up feeling sexy yourself.
Now, treat this addiction like any other, rather than trying to change his sexual behaviour/appetite overnight and him going cold turkey, try instead to wean him off his reliance on porn and back onto the two of you being together. Try watching porn together so he starts to associate getting aroused with being with you, rather than being alone. Get aroused together and maybe masturbate with him. From here you can step things up, for instance suggest that you masturbate him instead and tell him to relax and just watch the porn. He obviously enjoys dirty talk, so maybe ask him what he likes to hear and then you can try doing that whilst giving him a handjob.
Maybe roleplay could be an option? You take the role of the other woman on the phone, tell him over the phone what to do and that you're coming over and you want a seeing to, etc. I know other couples try out role playing different people like strangers to add spice and help keep things fresh. It can add naughtiness without the hurt of actually involving other people.
Basically, start out by involving yourself in his routine and gradually alter that routine to involve activities as a couple, increasing your role in his sexual gratification whilst decreasing the role of porn. I know it sounds like a lot of work and yes, it will take time but this problem sounds psychological as well as physical. Failing all that you might need to see a sex therapist or something, but if you play that card straight off the bat it might just make him feel bad/worse about it, which may hinder any chance of change.
Anyway, have a talk about it all and see what his thoughts/feelings are about trying to improve the situation. Good luck and all the best - hope it works out.