In case you want to know more, here's a link to the book at Amazon.
ETA: Upon re-reading this post, it occurred to me that some people might not get the sarcasm. The book in question is a children's book -- based on a true story! -- about two male penguins in a New York zoo who are given an egg to hatch and raise. The idea that homosexuality might occur in nature is so abhorrent to some people that And Tango Makes Three has risen to the top of many of the challenged/banned books lists in the United States.