So, upon reading some posts, you asked how that would work between two mares. I... won't tell you, but Twilight has a book on it. Seriously, she has a book. A storybook, mind, and it required two UNICORNS, and only ponies in CANTERLOT seem to believe it,but my point is proven. I think. Don't ask her why she kept it. Really, I mean, i still have the bruises.