In terms of women? She could have become a Christian after her rebellious teenage phase, or hoe-phase, or whatever, and its all still valid. Maybe she is a Christian but made a mistake, maybe she backslid or just went into sin and then went back to the Lord later. Or perhaps she really was not saved, because she was presented the wrong
message or was not mature enough when she was younger, but then came under conviction and had a more genuine and solid conversion later. In other words, it's more of a journey then some status.
Each person has a different story or life so its hard to say. If you want to ask, who is perfect, then nobody is perfect. I wouldn't assume any girl is an angel. People have flaws and weaknesses. Also, if she's really straight as a Christian, and you are with her, then you have to clean up your act too. You may not be allowed to look at movies or get too much enjoyment out of any secular content otherwise she might not feel comfortable about that. Any quirks or issues that might be okay, while you are single (ie especially if you have a habit of cussing under your breath if you are frustrated) could be an issue with her. You also have to watch your step and behave right.
I didn't mean it in a consdescending way when I asked "who is really a virgin?", but more as a matter of fact tone. That is not the most realistic advice.