That sounds like the alarmism of a religious fundamentalist, but hostility to scientific research comes from the progressive side when the question is the source of sexual preference.
That quote is from Martina Navratilova, who is one of the many critics of Charles Roselli, a researcher who is studying why some male sheep have a sexual preference for other males. Roselli tells his critics that he hates the idea of trying to manipulate the sexuality of human beings and claims that his real interest is in fact sheep.
Don't we accept the idea of sheep breeders doing what they can to get sheep who will in fact breed? Should someone who objects to efforts to cure human beings of homosexuality resist efforts to manipulate sheep? Assuming you don't care about the individuality and personal fulfillment of sheep -- and note that PETA started the campaign against Roselli -- don't you have to admit that any learning about sexual orientation will be applied to thinking about human beings?
But shouldn't we want to know the truth? Shouldn't gay rights advocates care when they sound like the religious fundamentalists they usually deride?