A little perspective from a parent of a kid actor:
A given % of the population is LGBTQ. An even greater % of LGBTQ individuals is represented in the acting scene. Just like a given % of the population is African American and a greater % of black people is represented in professional sports. Many Hollywood actors pay their dues for years in the theater scene, and although I would strongly warn people to not base their worldview on stereotypes, there is a little bit of truth to the stereotype that live theater is popular among gay men, especially.
My middle school aged daughter is an actress who has had some success locally for the last 4-5 years. She has been in 4 live shows with lengthy runs, some TV and voiceover work, has an agent, and is a member of a professional organization/union. I was a wrestler and wrestling coach and have no experience whatsoever with performing arts, so needless to say, my wife and I are VERY protective based on our preconceptions of what the industry is like ("casting couches", "Hollyweird", etc.) Honestly, every single person we have met has been wonderful and totally professional so far in our limited experience, especially her agency. However, about half of the men she's worked with/for, or even boys her age have been gay. She even jokes around about never being able to meet a boyfriend through her acting gigs..."all the cute ones are gay."
IMHO it's not acting that "turns" kid actors gay or bi. They always were gay or bi, but acting probably gave them a mutually supportive environment where they could be themselves without fear of being ostracized (like a school or sports environment). In fact, the tolerant environment of theater is probably what drew LGBTQ kids to acting in the first place, not the other way around.