Sounds suspect?

Startle! At my desk I'm listening to BBC Radio 4's 'Woman's Hour' and the presenter, the indomitable feminist Jenni Murray OBE, has just said: "And, of course, we know some people like to be spanked..." 
And I'm sure she did it with such a playful tone of voice, or did I imagine that? It was part of a discussion about violent porn, shades of grey and 'extreme' sex and privacy. Which is quite an interesting listen - hear it here.
I'll be having a listen again to check whether or not I'm right that my spank-dar picked up a bit of tonal variation on that "and, of course, we know some people like to be spanked..." When I've seen Ms Murray on the TV she has a habit of looking at the interviewer sternly over her glasses that is pure schoolmarm, which already had me wondering.