Your right. I did mean Interaction. Looks like I wasn't paying close enough attention with my spell check and proof reads.
There is a lot of people that do use the tags interchangeably. But some fans of specifics will get grumpy about it not actually being their tag. If you go somewhere that says they have what your looking for, and its not, you would get upset right? From my understanding. Futanari is the Japanese word for Hermaphroditism, or something with both Male Female Parts. So a Dick Girl, is someone that looks Female until you get their pants off. Kinda like a Trap, but it's not the quite the same. Futanari has Ass, Pussy, and Dick down there. In my own head I use Futa as one with no balls, and Futanari one with balls. But really its just an abbreviation.