Frank Tipler is the main person proposing this, and he wrote about FAP in The Physics of Immortality: https://www.amazon.com/Physics-Immortality-Modern-Cosmology-...

Here's a review: http://www.fourmilab.ch/documents/tipler.html

And here's a quote from it: "it would be possible for each male to be matched not merely with the most beautiful woman in the world . . . but to be matched with the most beautiful woman whose existence is logically possible."

verifiable here: http://articles.chicagotribune.com/1994-11-30/features/94113...

I have his previous book, co-written with John Barrow, The Anthropic Cosmological Principle. It's taken more seriously.