Question of the day: What's the difference between making love and having sex?

Question of the day: What's the difference between making love and having sex?

There are people who believe there's a difference between making love and having sex.

"Making love necessarily involves having sex. But having sex, even great sex, is not necessarily making love." this is according to a popular saying.

Are you one of those who believe in this saying? If so, tell us what you think the difference is...