When the guy says "hey, I'm a cuckoo", but later on backtracks on that and locks himself out of being in contact with you - that's a sign that the dude's probably being slowly brought up to that by his girl. I may be wrong. People can be manipulated into being someone who they're not.
Just of my experience - there was one girl with whom I ended up looking like embarassment and a shadow of myself. Another one made me feel like a tiger, ready to conquer the world and making me realise that I'm just wasting my potential being the lazy slob. Furthermore, there was one girl whom I was dating. And at some point, I couldn't get my thing up. At that point realisation came that "Hey, may be this girl is not for me". The relationship ended. Never had any problems like that before or after her. Shit just happened.
On what you've written here earlier, their relationship is doomed, IMO. Dragging it out further will just make matters worse.
I dunno...Then just have one on one with the dude and ask him what HE really wants, not what he wants to do to have his girl happy, not how he sees himself or something. Wouldn't surprise me if it ends up something like: "I don't know man, but I'm ready to do whatever it takes to keep her with me"
Mate, I'm 27) Having views different to yours doesn't make a dude inexperienced with another gender) Your relationship is your relationship: if that works for you - nice . But as a counterargument: okay, then one day dude's wife comes up to him and says: "Hey, I wanna go buy some white sand from Jerome on the block" - and he replies: "Cool, who am I to block you from experiencing pleasure from sniffing coke". Agreeing on relationship like this puts dude on a slippery slope where he may end up getting hurt.
It is simple to me - I belong to you and you belong to me. No? Well... cool, then I'm not the one for you. And as someone who is very experienced you should know that there are a lot of people like me who still see relationship in this, conservative way.
At the end of the day, just agree to disagree. But if the guy ends up being hurt with this whole thing, it will be sad.