Surely the Command against sexual sin is one of the most straightforward in the Gospels.
It has been mentioned before that Jesus occasionally uses overstatement and exaggeration to get his point across. This is obviously again the case here. No one seriously believes this Command is to be obeyed literally. None of Jesus' own disciples, to our knowledge, obeyed this Command as it stands, nor did Jesus expect them to.
At this point you may be wondering just how many commands of Jesus are in the series. In his book, The Commands, author Michael Phillips arranged our Lord’s commands into twelve sets of ten commands each: one hundred and twenty in total. So as you can see we have but a handful of Commands left.