Exploitation movie posters about monsters that wait under the water have a weakness for bikini girls. Great White (Enzo Castellari, 1981).
Alligator (Lewis Teague,1980)
Piranha (Joe Dante, 1978)
Kraken: Tentacles of Death (Tybor Takács, 2006)
(Cirio H. Santiago, 1987)
Piranha Part Two: The Spawnning (1981) This is a James Cameron movie!
Not even the sand is safe anymore. Blood Beach (Jeffrey Bloom, 1980)