It seems the most upvoted affirmative answers here are written by Christians. I do not know to what degree the answers depend on religion. Let me give an affirmative answer from a non-western atheist perspective. Being a resolute atheist, I will give an answer which is certainly not influenced by any religious consideration. (And each time I tell people I am and will stay a virgin until marriage, their first question is often whether I am religious.) Hopefully my answer will provide a new perspective.
For me, a big YES. I will soon be 25 this year, and I am still a virgin. And I’ve decided to stay a virgin until marriage.
Not only am I a virgin, I also stick to the principle that two can be together only if they can attain spiritual intimacy. Because of this principle, I do not date or even flirt casually.
Of course I’ve had crushes. Sometimes I do try to approach the girl who I find attractive in some non-sexual, non-flirtatious way.
The reason is because I value the spiritual part of a relationship much higher than the sexual part. I want to prove that we can establish sustainable spiritual intimacy before we get married. I believe real happiness is only possible when such spiritual intimacy is established. I want commitment to each other. I want a full and deep mutual understanding of each other. I long for the sacred feelings that I have when some girl gives me the hope of establishing such a relationship. Having premarital sex will only undermine such process. Once it starts getting sexual, you no longer know whether your intimacy is driven by spiritual feelings or by sexual desire, or even just the habit of having sex with the other person. I want a partner who is willing to do and capable of much more than simply to have sex with me. I want this proven before we marry each other.
Because I am so serious about the spiritual aspects and that it hurts so much emotionally if we break up, I am very cautious about getting into a romantic relationship. I would not even attempt to do so unless I believe I know the girl fairly well through non-flirtatious means. Were I not careful, I could easily be trapped into a relationship which would in the end hurt both of us emotionally.
Another important reason has to do with the value of novelty. I still remember the first time when I had a crush for a girl. I was too shy to approach her. During the period various thoughts and feelings, so poetically beautiful, spun in my head everyday. I could have written the most beautiful poems for her, had I had such talent, at the time, to render my imagination about her into words.
My crush for her eventually faded out. And then I had a crush for a second girl. I still had wonderful feelings, but it was nothing like the one I had had for the first girl. Analogously I believe that the feeling of having sex is also romanticized by its novelty. Such a sacred feeling relies on its novelty. I want to preserve this sacred novelty for my future wife.
That being said, I do not make a moral judgement when it comes to pre-marital sex or the way of dating, and I do not mind if my partner has had premarital sex before she knows me. I know people who’ve had premarital sex. Their having premarital sex does not lower their status in my evaluation of them. It’s their way of life and if they find it worth it, then good for them. So I do not think that having premarital sex is immoral.