Bisexual people, like lesbians and asexual people, are hard to find in the records from the 1800s. Usually, when people's stories are told in the newspapers, it's because they've been arrested. Bisexuality was not and has never been illegal, neither has being a lesbian or being asexual. However, there are articles that suggest bisexuality, and you'll find those here.
Image: Gift of Gael Newton AM and Paul Costigan through the Queensland Art Gallery | Gallery of Modern Art Foundation 2020, https://collection.qagoma.qld.gov.au/objects/35564