If you could have any wish come true, what would you wish for? When I pose this question to my students they often say things such as, “to be rich,” “to be famous,” or “to find the perfect mate.” But of all the responses I have heard, the words of Ashley, an 18-year-old high school senior, stand out most vividly in my mind. After I spoke on sexual purity at a Tuesday-night youth group, she came up to me with tears in her eyes and said, “If I could have one wish in life, it would be to go back four years ago and hear this same message. I might not have ruined my life.” Ashley simply said thanks, and then walked away.I have often wondered what decisions Ashley made that caused such deep scars in her life. Was she struggling with guilt or depression from a seemingly “harmless” hook-up? Did she get a sexually transmitted disease? Did she have an abortion? My heart went out to Ashley because I could see the pain on her face as she so deeply regretted her past choices. Somewhere she bought a false idea about sex, acted on it, and now she is paying a heavy price. Ashley learned a painful, yet powerful lesson: ideas have consequences. What you believe about sex will affect your choices, and your choices will shape the direction of your life. Misunderstanding the purpose and nature of sex can have disastrous consequences. So, what is the purpose of sex? And how can we find true love in a hook-up world?