Same sex marriage

In The Brief Bedford Reader the passage "What's wrong with gay marriage?" is the typical article  that strives to get everyone else on the bandwagon about Homo marriage. It has great points, sounds professional ,and the writing is good. As usual a passage of this nature will bashes on religion find loop hole in the system, to try wiggle around and find things that contradict. One of the loop holes found with gays is the "love is love" statement most everyone is pleading, what is stopping a man from marring a man, well nothing because it is legal now. What is stopping stopping a man from marring a child, well its against the law to do that, but why? If it was true love then why is that not allowed?