In her craft blog Write Here, Write Now, Lucy Hay posts on the reluctance of British and American writers to tackle sex scenes in their screenplays.
Which reminded me...
I once wrote a draft of a script with a sex scene where I constructed it as I would any kind of action - laid out the basic moves so it would reflect the characters and be a progression of the drama, not an interlude.
The script came back with a pencil stroke through the scene and the words Director's discretion in the margin.
So in the next draft I just wrote, "They shag enthusiastically".