These films are classified as R-18 or older rating equivalents. They contain graphic nudity, sexual situations, and violence intended for mature audiences only.

. Known for his versatility and magnetic screen presence, Estregan carved out a unique niche in local cinema, earning the title of "Penetration King" during the height of the erotic film boom. While often remembered for his daring roles, he was also a three-time FAMAS award-winning actor, proving that his talent went far beyond the provocative.

A landmark film in the adult genre. It showcased the transition of Philippine cinema toward more mature, liberal themes, with Estregan at the forefront of the movement. 3. Alupihang Dagat (1975)