What does “pure” mean?
This is difficult to answer as it has possible cultural/denominational nuance and could vary a huge amount according to each person’s intended meaning.
Pure for me in this context would be someone who has not only made a strong commitment against any and all sexual sin but has gained some measure of ground in it by the power of God.
In my personal use and I’m willing to bet those believers directly around me, a person can be pure and not be a virgin providing they fit the definition above. Virginity is a strange metric for me since we were all sinners at one point and an unbeliever’s commitment to morality apart from the grace of God will not save him and therefore can’t be considered pure.
Mind you when I say “gained some ground in it” I’m not intending to discount the power of Justification before God. I am however making the distinction for the purpose of having an eye toward Christian maturity since someone who is “looking for someone who is pure” is probably wise to avoid choosing a spouse who isn’t currently walking in sexual purity.
For me, purity means operating with sexual self-control, and directing all your sexual energy towards your spouse. If you’re not married yet, it means reserving your sexual energy/sexuality for your future spouse. There’s also the heart/mind component—that you’re not lusting after people who aren’t your spouse or allowing thoughts of sexual impurity dwell in your mind. Jesus taught that what happens in your heart and mind can be just as sinful (or just as pure) as physical acts. I think the mental and emotional dimensions have to be included in a definition of purity.