I'd respect them.
However, we'd talk about it. I'd tell them that I'd masturbate and do whatever I needed to give myself pleasure, like using toys or watching porn.
Although if they gave me that crap of me not being allowed to watch porn or using toys because they'd feel that's "cheating" or if they were "saving themselves for marriage", I'd break it off.
Otherwise we'd be wasting our time.
It would suck in the beginning but I would probably get used to them not wanting to have sex and just accept it. It's not like I can force myself on them so I'll just wait and be happy with the relationship.
Sex isn't important to me. I think it's just cruel to expect someone to do what they are not ready for just because of some urges you have. We are civilised being and our instincts do not control us (besides maybe breathing xD).