Actually, as someone who wishes to wait several years before having sex, poly is probably PERFECT for you
In a monogamous relationship, finding a sexually minded partner (as you've said you want) who is willing to wait years before going to bed with you...well, that's probably impossible. And even if you found someone like that, the chances of them cheating on you would be high. And you don't want someone asexual....because then they'll never want sex and you will, eventually.
But in a poly relationship, they could have, or be developing, another relationship, which could fulfill their physical needs till you were ready. And you don't have to feel the pressures of doing things before you're ready or feel guilt at denying your partner something.