anyone know of a book that is a guide to living with the opposite sex?

Question

My brother and his girlfriend just got an apartment together, and niether of them has lived with a different sex, in fact they both come from fraternity and sorority houses, and are already arguing about the basics such as toilet seat up or down. I keep telling him he has lots to learn if he wants to make this work. Anyone know of any books or articles that would help, i think it would be fun/funny to give it to them. Thanks

Answer 1

Men are from Mars, Women are from Venus.

Answer 2

The Bible