 The possible use of olfaction-biased mechanisms in human kin recognition and inbreeding avoidance was examined in three different types of study.The results indicated that olfaction may help mediate the development during childhood of incest avoidance (the Westermarck effect).Experiments were performed with the dioecious plant "Silene latifolia" to test whether post-pollination selection favors less related pollen donors and reduces inbreeding.