[Haze]

Not all guys are the same, keep that in mind. I know things get kind of tough when you have a problem and are unsure of how to get rid of it, but I'm sure he doesn't have any intentions of hurting you or doing anything that would make you uncomfortable. But if you're really unsure, bring another friend along, talk to him more about it (it's better to be more honest, if he's aware of the fact, then I'm sure he'd try to avoid upsetting you.) or just don't meet up with him at all.
Why you're talking about marriage already, I'm unsure. I don't think you should look that far into the relationship just yet. Honestly, if you're having troubles then just let him know, "Hey, there's this problem I have, it's nothing personal, but please understand." If you say it politely and let him know it's not just him, I'm sure he'll get it.