Tal's scenes are by far the most time consuming scenes, especially because of the background. I cannot render the characters separately because it won't match the shadows and the lights. Therefore I need to make a full complete render each time. And adjusting the scene can sometimes take 1 hour just to get things right!
It's easier to make a sex scene in a room, coz you just have to render the figures and the bed, then you can add the rest in background.