Making art does mean making whatever the hell you want. Maybe you're talking about commercial art, which isn't meant to be beautiful but marketable. Putting explicit sex into Baldur's Gate is a choice that directly affects its marketability, and so you're giving it a hard time for not being art.
A fade to black option doesn't seem as simple as a toggle, these scenes have actions being performed by the characters, and dialogue options connected to them, that might have an impact on more than just the choreography.
