Neil Patrick Harris and David Burtka have admitted they once had sex in the washroom of a European train.
The 45-year-old actor has been married to David - with whom he has eight-year-old twins Harper and Gideon - since 2014, and has admitted the "naughtiest" place they've ever had sex has been "in the washroom" of a European train.
Neil and David made the comments as they appeared on SiriusXM Hits 1 for a joint interview, after they were asked by the Jonas Brothers - who appeared on the show last week - to dish the dirt on the most outlandish place they've had sex.
'How I Met Your Mother' star Neil said: "I am so excited that the Jonas Brothers asked us this question. The naughtiest place we've sh***ed? I would probably say on a train. A European train. In the washroom of a train. It was hot."
To which David added: "We were actually going from somewhere in Europe. I think it was from Rome to, I don't know."