Research indicates that opposite-sex biological siblings tend to be sexually involved with each other much more frequently than opposite-sex adolescent stepsiblings.

Question

Quizplus · Accepted Answer

Research generally indicates that sexual involvement is more likely to occur between opposite-sex adolescent stepsiblings than between opposite-sex biological siblings, due to the lack of a biological relatedness inhibition known as the Westermarck effect.

Research Indicates That Opposite-Sex Biological Siblings Tend to Be Sexually