[Well, obviously there are double meanings and innuendo going on there, from both of them, so yeah... it probably is how he meant it. Jack is definitely appreciating that.
He chuckles again.] Don't ask me. I've no idea how they did it, but everything stayed pretty much the same, except for the lack of sunlight. Some kind of forcefield, I guess. I was a little too busy fighting Daleks to have to time to wonder about it at the time!