Guys have a mental calendar of days in the week, and below the days are empty boxes. On days when they have sex, the box gets a checked. The check mark means all is good and right in the world. An empty box means...not that.

Physical attraction did its part to glue them together, but something stronger than sexual attraction sealed the bond. When men and women grow apart, it is for the same reason they are drawn together; because they are finally, inherently too different. Friendships among women, on the other hand, were burdened by similarity.

I don't know what falling in love for me is. The concept of romantic love arose in the Middle Ages. Now remember, the Arabs don't even have a word for love—that is, a word for love apart from physical attraction or sex. And this separation of love and sex is a western concept, a Christian concept. As to what falling in love means, I'm uncertain. Love, well, it means simply physical attraction and liking a person at the same time.

It's love when someone can touch you without using their hands.