Oh .. hnag on ... it's ok keith ... I've found it.

You forgot to include that John R Diggs MD said all this in an article that he wrote for the following website.

http://www.catholiceducation.org/articles/homosexuality/ho0075.html

no bias there then.

Furthermore, he does not say what study he is referring to or where his claims can be verified.

In other words, he has merely given an unsubstantiated opinion.

Unsubstantiated opinions do not serve as evidence.