Hey there welcome to the forum!
First I would like to mention that the public boards are strictly non sexual. The forum is open to anyone above the age of 13 and so talk about sexual things isn't really appropriate with 13 year olds... there is a part of the forum where you can talk about this stuff called
the adult forum however.
Now to answer your question about what a furry is, the answer has been asked many times so our Cat Dragon (Cagon) queen Winged Zephyr has been kind enough to make a handy guide answering this exact question:
What is a furry?And the tl;dr version is a furry is anyone who is a fan of anthropormophised animals, that is animals with human-like qualities. Some just enjoy the art, some just enjoy the community, some get expensive suits so they can dress up as their original character, it's an extremely diverse group of people. But what you're describing in your post is something else, which if you're curious I can talk more about in PM.