I've seen both live action Centaur and MLP porn.
The Centaur was a human girl photoshopped to have an extra set of legs and a weird body to connect them. The hair on her head was copied and pasted on to her ass to make a tail.
The MLP thing looked like a statue. It was the basic shape of a pony but Caucasian instead of purple or pink or whatever. It had a human head and tits sticking out between it's legs. Some dude was putting his cock in it's mouth.
Mods feel free to delete this if it's 2lewd4kym.