How do you know it's fake I wanna believe it's real!!!
Well basically Futanari is a japanese word for "hermaphrodite". Hermaphrodite is an organism that has reproductive organs normally associated with both male and female sexes. So in a way its kinda real, as for anime its just a exaggerated fantasy.
Also does it make Me gay that I like the site lol?
Well on the website its just basically women that haves a very large penises. Which in our today's life a women with a penis would make them automatically a male. So you can figure out this on your own.