Mark Twain quotes
...the human being, like the immortals, natually places sexual intercourse far and away above all other joys -- yet he has left it out of his heaven! The very thought of it excites him; opportunity sets him wild; in this state he will risk life, reputation, everything -- even his queer heaven itself -- to make good that opportunity and ride it to the overwhelming climax. From youth to middle age all men and all women prize copulation above all other pleasures combined, yet it actually as I have said: it is not in their heaven; prayer takes its place.
Letters from the Earth