She is waiting for marriage to have sex with someone. yikes!
You know, I'm sure there are plenty of religious people here who will disagree with me on this. But for me? I'd never go for this.
As an experienced adult, I would worry about whether I would marry someone and then find out they are impotent or bad in bed. I would also worry that, unless it was in the context of some shared serious religious beliefs, that they were too low-drive for me or had other issues around sex that would interfere with that part of our relationship.
Now - if she's a virgin in her 20's? Maybe then I could understand.