The Star Trek actor said that he always wanted to reveal his sexuality on his own terms and so kept numerous colleagues in the dark before his announcement in October.
"I didn't tell anybody I was going to do it. I didn't tell my agent, I didn't tell my business partners, I didn't tell my publicists," he told Culture. "It's so funny, because obviously it was a huge decision for me, and I made it in a specific way.
"It was very much on my terms. But I never thought beyond the action of doing it. I never thought about the reaction it would generate. Honestly."
Quinto similarly stated in 2011 that he didn't expect confirmation of his sexuality to become global news.
The 34-year-old said he was inspired to come out by gay teenager Jamey Rodemeyer, who committed suicide last September after suffering homophobic bullying.
> Zachary Quinto "grateful" for support after coming out