Original: Prevalence is difficult to generalize, but research has estimated 10 â "15% of the general population as having at least one such sexual contact, with less than 2% involving intercourse or attempted intercourse.
Simplified: It is difficult to say how frequent incest is, but researchers have estimated that between 10% and 15% of people have at least one incest experience. Less than 2% of these involve intercourse or attempted intercourse.