With all kinds of bad theories, bad practices, and real bad woo.
Ask me how I know. And if personal testimony isn't sufficient, well, *gestures to the entire internet*
But we're talking about discussions during therapy. Orientation is a tricky thing. You very well could have a young gay man - or hell, an older one - in there wondering if they could change, or be more bisexual, or have fewer sexual thoughts, etc. Maybe they're not ready to come out of the closet - to their families or themselves - and they're just trying to find coping mechanisms to make their lives just a little bit easier.
Again, ask me how I know. I was a teenager really going through it, and it was probably the most depressed I have ever been in my entire life. I eventually found a really good therapist who probably saved me from harming myself. And our discussions would've raised some bureaucratic eyebrows under this kind of law, no doubt at all.
Do you really want the government in there? I do not.
People are looking at this ideologically instead of therapeutically.