I don't know the amount of erotic Tetris clones were made in early 90s, but it is clear that this particular genre, and clones of the Pajitnov game in general, have been perhaps the most abundant, or at least one of the most frequent when coders decide to make a game.

Today we uploaded together Sextris and this one, Super Sextris.
Made in the same year, Super Sextris has a larger playing area as a positive differential factor, having as lower negative point the gameplay, attributable to the higher speed of the chips.