>>15850257Anecdotal. I have lots of furry friends and a few are gay or bi, but most aren't. The furries online who are most actively looking for companionship within the fandom are gay, because one of the biggest difficulties for them is finding other gay people irl. Most of the straight furries I know or have known who are in relationships are with someone who is not in the fandom.
If you want a very simple by-the-numbers analysis, E621 is the largest aggregator of furry art on the internet, and currently there are 435k images tagged "male on female" and 319k tagged for "male on male." This is not a scientific analysis, but it points to more people in the fandom being interested in male and female relations than male and male.
The female/female tag is only at 68k, which suggests that lesbians are the smallest group within the fandom. In my personal experience, this is pretty accurate. The only people I've ever encountered who identified themselves as lesbians were trannies. I have encountered a few bi women and am friends with one, and the vast majority of women in the fandom are straight.