Subtleties of Lust!

Fluttershy and Big Mac go out on a date, and there is lots of lust and kissing and love, because that's what grown ponies do, right?

Fluttershy and Big Mac love each other, so they want to do grown up pony stuff, right? That's what two mature, adult ponies do. So, they do all sorts of lusty things, because they love each other, and are attracted to each other, and stuff.