I think there's a lot to be learned by studying all this, but boy is it an ethical minefield.
There's no question that you can get an AI to drop into a 'boyfriend' or 'girlfriend' mode, using the sum total of human discourse as its neural network (okay, using GPT), but in so doing it's revealing more about us than it is about itself. It doesn't know how to male, or how to female, except for what it draws from us. Its failures are revealing on a very deep level.
Last time I looked at character.ai, the most popular character was the guy from Twilight.
I’m not sure there’s an assumption, more that the author is a straight guy and creating things based on his experience and perspective. Would the creator even know what a woman, or someone like myself wanted in a partner?
There is truth to our industry being predominantly male though, so this probably gets more interest from people on sites like HN and Reddit.
The benefit of a more neutral rebrand though, since you're asking, is that you could roughly double your potential market.