>>3 Don't agree.
Having sex isn't the only important part of a relationship. Anybody who says that any connection without sex is a 'friendship' or that any connection with sex is a 'relationship' is a dumbfuck, to be blunt, whose opinion is invalid due to fuckbuddies and eternal virgins who are happily married. A true relationship is a mental, emotional, AND physical connection. If they're great in bed, it's a fuckton better, but as important as sex is, it's not the only thing that makes a relationship. When it comes to dating in general, the sex is more important since you're usually not aiming for that connection. But if you want a long-lasting relationship, the sex isn't the only thing that's important.
Although, I don't agree with "no sex until marriage." I'll word my reasoning like my mom did: "What if he whips out his thing and it's miniaturized? That would be horrible. How could you ever want to sleep with that shit? If you're going to wait to have sex after marriage, at LEAST strip him. And don't wait until right before the wedding, either."
Anyway, yeah.
>>1 It's not your life. Get the fuck out of her business. She'll follow her morals, and you follow yours. If it ends up well, she won't need your worry. If it ends up bad, be there for her to fall back on. Chances are, if she doesn't believe in sex before marriage, she won't know what "good" or "bad" sex is by the time she's married, and it won't bother her because she won't know that he's bad in bed if she has no one to compare it to.