Sexual attraction to the same gender is not a choice.
It is present in nature, consistently, and has been present in humanity, consistently, throughout history.
What each of us does with that attraction is the only thing we can really choose. The relationships we pursue, casual and otherwise, are the choices. The sexual attraction that drives those choices is not itself a choice.
Attempting to "cure" an attraction is a spectacularly ridiculous thing for anyone to pursue, for themselves or their children... but I say let them try to pursue it. I enjoy seeing stupid people have to deal with the negative consequences of their stupid decisions. Any attempt to ban them from pursuing "conversion therapy" would threaten my enjoyment in watching them fail.
As far as the choice of having homosexual sex or a homosexual long-term committed relationship, there exists no concern on the part of the government, at any level, that outweighs the individual's right as an adult to engage in those activities with other willing adults. Period.