...Sabik: Kasalanan Ba? (1986)

Is it a sin?

Ubiquitous Filipino sexfilm actor Estregan sets in motion a sleazy chain of events when he successfully seduces his stepdaughter (Mauricio). While her mother, his wife (Ramirez), is none the wiser the younger daughter (Sumilang) spies on their heated couplings with guilty excitement. Inevitably his attentions turn to this curious virgin. Although at first she resists his affection, it’s only a matter of time before she relents, in surprising hardcore fashion.