Q: Is it okay to have sex while you're engaged?
A: No, it's not. When two people have sex they're saying with their bodies exactly what they said at the altar: I give myself to you completely, without reservation, to be open to new life, until death do us part. Sex "says" these vows. Your body speaks a language - we can say things with our body language - and sex outside of marriage lies; it's saying something with your body that your relationship can't back up. You haven't made that vow yet. Furthermore, engagement is still a time of discernment. You haven't fully made that decision, and having sex can cloud that discernment process.