I think if the love is there and is real, you can definitely wait to have sex. A man who genuinely loves his partner will be willing to respect her desire to wait, as long as she explains her reasons. If the relationship is meant to be, and a good match for both of them, it will move forward, and sex will be part of it at some point. I dated my first serious boyfriend for two years before we had sex (granted, I was 17 and a virgin when we first started dating). But, even as adults, that respect for a partner who wants to wait should be there from someone who truly loves them.
Then again, I also hear men saying they would never marry someone before they had sex with them. I had sex with my husband on our second date, and we've been married a long time. But, I don't think the fact I jumped into bed with him so quickly had anything to do with it.