I'd have a hard time believing that the results are credible. If they were, such a conclusion from 1981 would have far more profound impact on the current debate. I did a quick Google search and could only find a few quotes from the book on some pro-gay Web sites, no serious discussion of what is done there. However, there are FReepers who keep up with the responses to various studies far better than I, so I am going to ask them for their opinions.
Guys - what's the consensus on Bell 1981? Feel free to ask others who might know.
Shalom.
It's likely at your local library. Feel free to read it yourself and draw your own conclusions. It's okay to do that now and then...