There's a great book about the original instance of this software, https://www.amazon.com/My-Tiny-Life-Passion-Virtual/dp/08050... fun old internet flamewars and a lot of discussion about the gender spectrum and how it's expressed by individuals online.

If you're interested in more about LambdaMOO, Julian Dibbell's My Tiny Life is a good read: https://www.amazon.com/My-Tiny-Life-Passion-Virtual/dp/08050...