What is Marriage? (the book)

Sherif Girgis, Ryan Anderson, and I recently had an op ed piece in the Wall Street Journal defendng the idea of marriage as a conjugal union.  Here's a link:

http://online.wsj.com/article_email/SB10001424127887323353204578128841842931734-lMyQjAxMTAyMDIwMDEyNDAyWj.html?utm_source=RTA+WSJ+Marriage&utm_campaign=winstorg&utm_medium=email

The piece is a kind of precis of our new book What is Marriage? Man and Woman: A Defense (Encounter Books). The book develops and strengthens the argument we originally advanced in our article "What is Marriage?" in the 2010 volume of the Harvard Journal of Law and Public Policy. The book has a website here: http://whatismarriagebook.com/.