For a minute I seriously considered reading Father James Martin's controversial book, Building a Bridge. 

As a Catholic man who has struggled with same-sex attraction and runs a website about the subject, the topic obviously has great importance to me.

I have read numerous reviews of the book and engaged in discussions with folks all over the theological spectrum, particularly among those who find themselves primarily attracted to their own sex. Some think the book is great; others think it's awful and still others every shade in between.

The sacrament, as a visible sign, is constituted with man, as a body, by means of his visible masculinity and femininity. The body, and it alone, is capable of making visible what is invisible: the spiritual and the divine. It was created to transfer into the visible reality of the world the mystery hidden since time immemorial in God, and thus be a sign of it. So in man created in the image of God there was revealed, in a way, the very sacramentality of creation, the sacramentality of the world. 
- Pope Saint John Paul II, Theology of the Body, February 20, 1980
 
What sign can you do, that we may see and believe in you? What can you do?” (John 6:30)

This is the question posed by the unbelieving Jewish authorities to Jesus. Although their intentions may not have been the most pure, the fact is that we all look for signs of one sort or another. We are truly a symbolic people and without symbols, it would be difficult to assign meaning to anything in life. Whether it is a simple stop sign or a complex literary piece, it seems like part of the human condition to look for the symbolic, to look for signs.

Saint John Paul II really drove this point home in his great catechesis known as Theology of the Body, where he proposes Christian marriage as the closest sign on earth to the mystery of Blessed Trinity. More on that later.