Please, for the love of God, know that sex is normal and natural. Please do not feel shame if you end up giving in to normal biological urges, but before you do please seek out comprehensive information on sex, contraception, and protection.
I readily concede that moral boundaries and restraint are crucial to good living. But I am suspicious of the Pharisaic distortions, namely an irrational rigidity, or the sorts of bizarre loopholes and rationalizations common to those who take abstinence vows.
Christians are as wildly for sex as anyone; that's what got Bristol into trouble. They simply have an idealized notion of it, one that's increasingly divorced from the reality and the direction of the larger society.