The Sirens of Titan by Kurt Vonnegut Jr.

The Sirens of Titan is an outrageous romp through space, time, and morality. The richest, most depraved man on Earth, Malachi Constant, is offered a chance to take a space journey to distant worlds with a beautiful woman at his side. Of course there's a catch to the invitation—and a prophetic vision about the purpose of human life that only Vonnegut has the courage to tell.

https://www.goodreads.com/book/show/4982.The_Sirens_of_Titan

We will meet at the Twisted Pine again. Let's try to meet outside this time.

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Here's a spreadsheet to organize suggestions for future books, you can access it here:
https://docs.google.com/spreadsheets/d/1Ku6a3gPzAJiuSBD5vYtxcf8RbLt_qEdnEpEngmAXfOk/edit?usp=sharing
Feel free to suggest any book, and if you want to vote for a book just add your name to the votes column.