For there is nothing about man that is not strange to an immortal. He looks at nothing as we look at it, his sense of proportion is quite different from ours, and his sense of values is so widely divergent from ours, that with all our large intellectual powers it is not likely that even the most gifted among us would ever be quite able to understand it.
For instance, take this sample: he has imagined a heaven, and has left entirely out of it the supremest of all his delights, the one ecstasy that stands first and foremost in the heart of every individual of his race -- and of ours -- sexual intercourse!
It is as if a lost and perishing person in a roasting desert should be told by a rescuer he might choose and have all longed-for things but one, and he should elect to leave out water!
To wit, that the human being, like the immortals, naturally 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 is actually as I have said: it is not in their heaven; prayer takes its place.
--Letters From the Earth