Especially habit. Two people can go on having sexual intercourse from habit in just the same way as they grow hungry at the hour they’re accustomed to have their meals. Of course there can be desire without love. Desire isn’t passion. Desire is the natural consequence of the sexual instinct and it isn’t of any more importance than any other function of the human animal. That’s why women are foolish to make a song and dance if their husbands have an occasional flutter when the time and the place are propitious.”
