Not only is it illegal to have sex with the lights on, one may not have sex in any position other than missionary.

18.2-361. Crimes against nature. A. If any person carnally knows in any manner any brute animal, or carnally knows any male or female person by the anus or by or with the mouth, or voluntarily submits to such carnal knowledge, he or she shall be guilty of a Class 6 felony, except as provided in…