The Good Morning America skit was funny. I don't know if I'd classify it as "dirty" but it was suggestive. Piggy tells Kermit that he left his socks over at her place. "Putting your shoes under somebody's bed" is a emphemism for sleeping with them (which is also a emphemism, but I'll stop there), so I suppose leaving your socks sort of has the same implication. In case there was any doubt, Piggy said (and I'm paraphrasing) that frogs have incredible stamina, "I mean, like, lay in supplies for the weekend" and Kermit just sat there looking smug and basking it in, although he did act a little blush-y and embarrassed because "frogs don't usually talk about that stuff."
You have to just think about what it was like for Jim and Frank--on live television--to start one-upping each other with this conversation with NO IDEA where it was going to land, but the point is that Jim and Frank felt that they could speak for their characters off-script--and did! And they acted out of the relationship that they both believed existed for their two characters. Don't misunderstand--Jim and Frank were both fully aware that they were making up reality as they went, but they were doing so within the parameters of the relationship as they understood it. And in that moment, Kermit and Piggy and their life togeter was as real as any other talk show guest's would be if he or she was talking about their life/relationship.
I know that in fandoms there are always folks who want to pair people up with people that they aren't with in the fandom story, but talking about the Kermit/Piggy relationship is not that at all. It was real. I saw it. I grew up with it. (And loved it.) With the premiere of "The Muppets," it looks like it's real again, and notice this: Everything they show in the movie and everything they tell in the book go along with the facts that Piggy and Kermit were in love and had dated for years before they parted company (if you accept the new movie as canon--which there IS none, but still). In Paris, Kermit doesn't say, "Piggy, I've always liked you but I've never had those feelings about you." I did rather like how they said it in the book, once I steeled myself to read it.
Kermit is in his office looking at the Miss Piggy half of the wedding photograph. He has just been to her office to look for her but she is not there, so he rummages (snoops) a little in her desk and finds that Piggy has kept half of their movie wedding photo after all--the half with him in it--so he goes back to his office to look for his half. This is where Piggy finds him, and surprises him.
"You saved it? All this time?"
"Piggy?" Kermit looked up, startled.
Piggy says "Oh, Kermie," and holds up her half of the photo alongside his.
"It's always been you, Piggy, always," Kermit admitted.
"I know, Kermie," Miss Piggy said. "And you to me. Always."
We didn't quite get that in the movie, but close to it--the same meaning. In the movie, Kermit admits he's not good at saying these things. He never says he's not good at feeling them. And Piggy--who does love him, and always has--meets him over the halfway mark because, as she has observed in the past, she's a "one-frog pig."
Yeah. You go, girl!