Even the brothel in DD was pretty tame. There was a quest to 'find the tarts' for a couple guys new to the city; once there you could talk to an employee (male or female), and if you paid them, I think they may have started walking towards a side room, and then there was just a fade to black, and back to normal screen (with an experience point bonus for the first time).
That was pushing the boundaries too much for the ratings for D2:ED, so what 30johner mentioned is probably it for suggestive themes.
