The genesis of the thread re: "I'm My Own Grandpa" and the reference to "All You Zombies" by Robert A. Heinlein is a great remembrance of a truly seminal short story about sex, time, and time-travel. It's the kind of story a young man writes during a brilliant evening, similar to what happened with Isaac Asimov the evening he wrote "Nightfall". or Arthur C. Clarke with "The Ten Billion Names of God".

"All You Zombies
" is brilliantly interwoven, both sad and hilarious and unrestrained, especially since it was written in the 50s.

And it also has a listing of The Bylaws of Time, among them are:

A Stitch in Time Saves Nine Billion.
Ancestors are Just People
It is Earlier When You Think