The series is steamy but chaste. Scarcely a ripped bodice, with talk of bundling, in lieu of mating. I guess I’m asking, is sex impossible?

Tune in to Season 2 to find out! I don’t want to give too much away, but in the first season, we have a bit of frottage, and that sort of heavy petting might involve a digit, and I really don’t want to go any further.

Were those magic scenes — you bounding after a stag, Diana flying into the air — fun to shoot?

In general, the magic didn’t seem very magic when we were doing it. Because it was actually things moving being attached to fishing wire, or your castmate on a rope. It felt quite low-rent, but it looks fantastic on the screen now that we have special effects. I did manage to break a bone in my hand in the Bodleian Library because for some reason the stunt guy was upset and wasn’t there. So I decided to do it myself. And here’s a little note, children: If you’ve got a really good stunt man standing by, let him do it.

What’s it like to bite a neck?

There’s giggling. Then there’s going hysterical.

I know you’ve been sworn to secrecy about the “Downton Abbey” movie and appear briefly at the end. But Michelle Dockery has described Lady Mary and Henry Talbot as “settled” and “good friends.” Where did the passion go?!

There’s a huge respect between them. He knows that she’s taking on the whole of the estate and everything else. And I would imagine that there’s a sort of rumpy-pumpy pretty frequent between the two of them. They’ve got a kid now, things are good now. They’re settled. He’s working. When he’s not away, he’s in bed with her, I would say, most nights — unless he’s parked out by the decanter, which is where he should be.

Sadly, you’re now too young for Season 3 of “The Crown.”

“The Crown” was a blast, actually. When you’ve got a brilliant actor [like Vanessa Kirby] opposite you and you’ve got great words to say and you’ve got a director like we had, it was just a joy. Ben Caron is really going places. And he’s directing the first four episodes of Season 3, which we shall all watch through gritted teeth because we would still like to be doing it ourselves. If you’ve seen Ben Daniels, he looks amazing as Antony Armstrong-Jones — he’s got the most piercing blue eyes — and I think he’s going to smash it out of the park. I just hope people will judge it for a different era rather than saying what I suspect they might: “Oh, he’s so much better than Goode.” [Laughs.]