How is that remotely deducible from that the scene? If you say that the use of the memory worm is an act of rape, then it's the Doctor who, with Strax is about to commit it. The humor of the scene isn't found in the act they are going to perpetrate on Clara, it's found in the reversal of fortune upon Strax who goes to get the worm and doesn't use the gauntlet. On that level, there is no "rape," rather there is a reversal of fortune - a form of poetic justice, and there is nothing innately wrong with finding humor in a poetic reversal of fortune. Rather the reverse is often true (pun intended). I find your accusation sorely misplaced.