The Theory That There Is a Natural Aversion to Sexual

The theory that there is a natural aversion to sexual intercourse among those who have grown up together:

A) may explain why sexual attraction is rare between members of the same kibbutz in Israel.
B) explains why cultures need such a strong incest taboo.
C) does not explain why incidents of incest occur in nuclear families.
D) has some evidence supporting that such an aversion may be developed.
E) may explain why marriages of familiarity seem to have more infidelity and sexual difficulties.