No..You are definately thinking wrong, they are not insane, they are very well in the mind and very healthy. Their thirst for s3x is just uncontrolable at the moment and they decided to do it no matter what.
God help us for the stupid western culture of shame has come here to stay. How could they? Anybody would pass them for mad people but they are very sane and thinks very well. hmmm.
Download video and watch..Then you can make your judgement.