Alex Kingston once left an actor in need of medical attention after biting his tongue during an onstage kiss.

The British actress, Kingston was unhappy when the unnamed star used his tongue in their kissing scenes, and issued a warning to him to stop the saucy smooch.

this actor, every time we did this kiss, he would stick his tongue down my throat.. So I said, 'If you do that again I will bite your tongue'

The actor refused and Kingston, who has vowed not to name the actor, bit his tongue while they were mid-performance - and it was only the next day that the former E.R. actress realised the severity of what she had done.

She tells Britain's The Graham Norton Show, "Interestingly, and I'm not going to mention the actor's name... I did do a job once. I did a play and at the end of the play there was a kiss and we'd been doing this for a long time, a long run, and this actor, every time we did this kiss, he would stick his tongue down my throat...

"So I said, 'If you do that again I will bite your tongue', and I think he thought I was joking so the next performance he did it again and I bit his tongue and clung on for a while, and didn't think anything of it - and then the next day, when we were backstage and I bumped into him, he was just having soup and I couldn't understand why he wasn't eating anything more substantial, so I said, 'You're only having soup?' and he said, 'I've got four stitches in my tongue'. I had actually bitten through his tongue! I warned him!"