To add on to this: if you're a "guy" still trying to feel out some really confusing feelings, playing a vixen online allows you to explore those feelings without it impacting your real life. It's the same reason it's pretty common for trans people to report preferring to play characters of their true gender in video games. It gives you a safe, low-stakes way to explore gender.

With furry especially, that particular fandom has for decades been openly and loudly supportive of LGBTQ+ people and a very very significant percentage are queer. It's a very, very safe place for exploration.