Never?????!? WHAT KIND OF QUESTION IS THAT YOU FILTHY WHORE? Haha, just kidding. The worst time to have sex is in front of your mother.
sorry for that just i want u to mention a time which u see very bad to have sex in?? u can mention for example at 7 am also u can say that ur worst time to have sex in is after peing for example...lool its like this :d