Abstract

I contend that there are strong moral reasons for most adult family members to avoid having sex with one another; indeed, I argue that even among consenting adults, incestuous sex is usually wrong. The argument is simple. Absent compelling reasons, it's wrong to take a significant risk with something that's extremely valuable. But having sex with a family member takes a significant risk with something extremely valuable—namely, a family relationship. And since compelling reasons for taking such a risk are very hard to come by, it follows that incest is usually wrong.