Now,I'm not against adult Flash.
But if you're going to have Mario humping the princess,at least do something to show that they're having sex,like having the princess' skirt lifted so,even though you can't see anything,you know she's getting it on and not just an intense dry humping section. But that's really more personal opinion. I say if you're going to do this,go whole hog and show some skin.
The "song" was just a lot of noise and got annoying easily. Could've used some more backgrounds too. Well,that's all I got for complaints. The rest,the concept,animation,and drawings are good and you should definatly do more Flash movies. Good luck. :)