Theoretically, yes, but sadly the reality isn't quite like that. Passion/desire often trumps doctrine, and doing something that one thinks one shouldn't do can have all sorts of nasty consequences, ranging from teen pregnancy to untreated STD's.

Having been an Evangelical Christian and 'assistant teen pastor' in a previous life, I've seen this in action in many different areas of life. People constantly did things they believed were wrong, and the combination of not being prepared or informed about those things and feeling ashamed about it afterwards led to a lot of suffering.