"When people say love can endure after passion they're talking of something else, affection, kindliness, community of taste and interest and habit. 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 a desire without love. Desire isn't passion. Desire is the natural consequence of the sexual istinct and it isn't of ny more importance than any other fuction of the hyman nanial...
...Unless love is passion, it's not love, but something else..."
Razor's Edge, Maugham