JLA Forums has an interesting video allegedly of Holloway and van der Sloot getting it on on an air mattress on the beach. It's in two parts:
http://www.jlaforums.com/music_song.php?song_id=666
http://www.jlaforums.com/music_song.php?song_id=667
You need to sign up (free, but I advise using a fake name and a throw-away email).
It looks like them, and if it is, there is no evidence of coercion or undue intoxication. It starts with a lewinsky and progresses to dog-style and female superior.
That's just stupid.