Also, do you notice what he is saying about 'estrogen', yet, no one question why SO MANY people now claim to be or are GAY. I do not dispute that some people are really born Gay, but I think that just as much or more homosexuality is environmentally/artificially induced to begin with by the saturation of toxins that reek hormonal havoc on human genes. I'll go even further, and suggest that it probably has a lot to do with so many men today obviously having the mentality of women, and I'm not talking about Gay men.
He goes more into detail on his experiments here. Although he isn't making an argument one way or another, its clear that there he (and other scientist) have published material that raises the question between the introduction of toxins to our environment and sexual behavior/inclinations. This is an aspect of homosexuality that most of those activist do not want to discuss. Depending on how they argue in favor of the normality of homosexuality, his research cast doubt on that framing.