It is opposed to science because they're claiming that it's possible to choose your sexual orientation, which is simply impossible, and studies have shown that there are people who are truly only attracted to one sex. The fact that conversion therapy fails every time also gives credibility to the fact that sexual orientation is an immutable trait. As a lesbian, I'm sure you can understand that you will never be attracted to men, even if you really tried. Are you really saying that the claim that it's possible to choose your sexual orientation isn't anti-science?

I think you're taking a too black-and-white view on this subject. Studies showing that some people are responding sexually to stimuli representing only one sex does not prove that those people cannot change their sexuality, nor even that those people are exclusively attracted to one sex. Now, I will emphasize: I don't believe it's possible to change one's sexuality, and I do believe there are people who are exclusively attracted to one sex or the other. But refusing to consider the possibility that that ISN'T the case would itself be "anti-science." Science is a process of experimentation, it doesn't give very many definitive answers about the way the world works - especially when it comes to a subject as complex as human sexuality.

Saying that conversion therapy fails every time and is therefore anti-science is not a pro-science mindset either. What we can say is that the methods that have been attempted appear not to be effective. We can also say that there does not appear to be a compelling reason to force someone to change their sexuality, so further experiments may be cruel. But if someone swears to know of a method that does work, and doesn't infringe on human dignity? I would simply want to see the evidence.

As for political lesbianism, telling women they can choose to be lesbians seems silly and counter-productive. But "science" does not say, definitively, that this is impossible. There are women that believe it is possible, and some women who swear it has worked for them. I don't believe them, but calling them "anti-science" is not going to convince them they're wrong. And who cares? So long as they aren't forcing other women to go along with it the way TRAs do, they can believe what they want. To me, if a woman is in a sexual relationship with another woman, they're lesbians. If they're living together in sexless relationship, they're roommates/friends. I don't care what they call it in either case.