This article explains the possibility of the process:
By studying the brains of the homosexual rams, scientists pinpointed the mechanisms influencing their sexual orientation.
They gave the sheep injections to adjust the levels of hormones in their brains and some of the previously gay rams became attracted to ewes.
If I were to guess a possible argument from the Right, it might come out as something like:
“If treating depression with drugs is possible because it’s from a chemical balance, then why can’t we say that homosexuality is also a form of a chemical imbalance?”
I really hope I didn’t give them any ideas.