Reply
Cleric, how about the fact that:
(a) You and your sex partner have just participated in thievery, because you've both stolen something from each of your future spouses. That's what fornication is, Cleric. It's not just, "Hey! Let's have fun and have great sex." It's about stealing something precious from the future spouses of each partner. The husband or wife should be the only one to take their partner's virginity. How dare anyone steal that opportunity?
(b) If you are a Christian, you are not only sinning against your own body and the body of your partner. You are sinning against the Holy Spirit, who resides within you. Are you okay with that?
(c) This is called fornication. Read the Bible and find out what happens to fornicators.
(d) Every time you have sex, you are joined not only physically, but spiritually with your partner. Do you honestly believe that it's acceptable to become joined with multiple sex partners?
(e) Do you believe that it's okay to have empty, meaningless, often brief sexual relationships?
The list goes on and on, Cleric.