You better go to the dictionary and look up the word "heritable". It means "inherited" which means "born with" - not "acquired". Some people are born funny, some people are born smart, some people are born mean and some people are born queer and this scientist says that "evidence from twin studies does in fact support" that. Granted - he feels that the "predisposition" is what is inherited - but that is exactly what makes people queer - the "predisposition" to be queer. You can change the meaning of his words to mean "hostile to the born gay argument" - but that is not what the man said:
"An area of particularly strong public interest is the genetic basis of homosexuality. Evidence from twin studies does in fact support the conclusion that heritable factors play a role in male homosexuality.
By the way - many of these twin studies were done on twins separated at birth - so the "environmental" argument does not hold water.
I'm quite familiar with the subject. I suggest you read my profile to find numerous articles on the subject as it appears you are confused. One article in my profile will help: The Gay Gene? Pay particular attention to the summary.