"After exposure to X-rated sexual films, men are subsequently more accepting of women's sexual submission to men and more likely to perceive a woman's friendliness as sexual interest."
Movies which portray women as sexual objects in the hands of a dominant male character convey this image of sexuality as being the way it is in normal life.
Besides, in these films, sexual intercourse is often the result of a woman's advances towards a male character, in order to move the plot forward; thus leading men to think that any woman's gesture towards them may be an invitation to intercourse.