Sex only exists within the bounds of marriage for God. Anything else is sin. But man is evil and he desires to serve his carnal nature rather than serve God. Unsaved men or the world thinks that sex is normal outside of marriage. They believe dating is one step in getting somebody in bed as per a normal relationship in dating someone. For nobody dates today with the intention that they do not want to be close intimately. I imagine there are a few. But these are the types of dates that are not descriptive of a normal relationship. Dating involves a romantic level at some point. It involves one in being intimate with someone, both for the unbeliever and the believer. To the believer, sex is only within marriage and It is about joining with them and becoming one flesh. For surely if taking a woman to the Prom is not about wanting to be close to them intimately at some point (Both mentailly, physically, (and or spiritually in the case with believers)), then why don't people just ask one of their own good friends of the same sex to go to the prom with them as their date?