...to read DURING sex. Probably best left unexplored is why I thought of this in the first place.

Starters:
The Rules
He’s Just Not That Into You
The Prince
The Wealth of Nations
Battlefield Earth

From Lauren:
The Ultimate Weight Solution: The 7 Keys to Weight Loss Freedom by Dr. Phil
Atkins Diabetes Revolution
Who Moved My Cheese? (Bonus points if partner is ALSO reading, “Nobody Moved My Cheese” by Ross Shafer)

From Amanda:
Rise and Fall of the Third Reich - Unabridged

Answering “No one should read during sex” is automatic memefail on the grounds of breaking the fourth wall.