Thanks all for the search and finds so far. I've seen some of those shower and beach scenes in the internet past, too. Always in the shape of a short compilation. The bloke is called Roberto, and at the time he was, if I recall correctly, Tiffany's personal life boyfriend.
Roberto did a few scenes with Tiff, a.o. in
Boobarella (the probably well known 'van scene' with Staci Vaughn and Tiff). I guess that the beach clips were shot during the filming of that particular movie. It would be great indeed if someone was able to find lengthier clips.