Jim Naughton at The Lead links to a Psychology Today blog which shares an e-mail from a pastor uncomfortable with bonobo behavior.
Although the pastor in question seems to believe that after Adam and Eve ate a literal fruit from a literal tree of knowledge, God intervened in the world to force tectonic plates to shift and bonobos to start having homosexual intercourse, I think there are far simpler and more satisfactory ways to make sense of the available evidence. But for those reading Romans 1 in English, and assuming that Paul meant by “natural” what we today mean by “natural”, evidence such as that from observing bonobo behavior leads naturally (if you’ll forgive the expression) to the conclusion that Paul was wrong. For whether you think they are right or wrong, one thing homosexual acts clearly are not is “unnatural” in the sense that that word is used in modern English.
In my opinion, gay (in the classic English sense, of course) bonobos can offer natural revelation to Christians, and hopefully challenge us to dig deeper than a superficial understanding of the Bible as well as of science.