Although quite a few people missed it at the time, Disney+'s Loki did indeed confirm that the title character is bisexual.
During the third episode, Sylvie asks The God of Mischief about his past lovers: “How about you? You’re a prince. Must’ve been would-be-princesses or, perhaps, another prince?” Loki then replies, “A bit of both. I suspect the same as you.”
Understated as this exchange may have been, the implications were clear, and it established Loki as the Marvel Cinematic Universe's first LGBTQ+ lead. Star Tom Hiddleston was asked about making the transition to the small screen during an interview with The Guardian, and said he hoped the reveal resonated with "people who spotted it."
"I was just really honoured to be asked," he said of reprising his MCU role for the Disney+ show. "We all wanted to retain the integrity of the character – I wanted to make sure we didn’t lose the bits that people loved, while doing something new. I also hope Loki coming out as bisexual was meaningful to people who spotted it. It was a small step, and there’s further to go. But it was definitely important to all of us."
It remains to be seen if Loki's sexuality is addressed again moving forward, but with Sylvie as the current object of his affections, it may not even come up (pardon the pun) in season 2.
We still know very little about Loki's next small-screen adventure, but Michael Waldron will not be returning as head writer/showrunner, so the second season may turn out to be a very different beast altogether.