You can download Colegas using either a bittorrent engine (utorrent is great, after you've installed it just google colegas torrent) or you can try emule which requires multiple searching various servers.
His Colegas film has the best scene due to it not being so brief, but he does have one equally good scene in Navajeros where he gets up from a bath which is not too brief either. El Pico has a couple of nude scenes, one very brief, the other involves some of that jiggling cock you said you like to see, and El Pico 2 has a bedroom scene where he takes his time pulling his trousers up, you kinda get the feeling that he is teasing in that one. Also is one of the few times you see his ass. In a different scene, tho not seeing anything of nudity, a very hot liitle event where he is in a jail cell with a a few guys looking to score (drugs), he stands with his top on and his y-fronts, the guy he stands in front of grabs a hold of his undies and pulls them down slightly, just enough to caress his bare ass, we don't see his ass, but we see enough for the turn on.