The effect of porn on human brains can be compared to that of cocaine. Some psychologists claim that watching pornography for a long time is stimulated by predominant scenes of group sex, sadomasochism, and sexual contact with animals.
Definitely, you should know a measure in this matter. Why? Because such films may have an excessive impact on your mind. This can cause some negative consequences such as the lack of “ordinary” desire or not considering coitus in a classical way.