That is why I presented the hypothesis that the extended family composed of a mother, sons, and immigrant females is the original form of the human family. As a preliminary condition of pair formation, the attachment of offspring to the mother must be sufficiently established. There are various patterns of courtship displays. In the first form, a male attracts the attention of a female who is far enough away that she cannot be touched, faces her, and spreads his thighs. While exposing his erect penis, he sits or moves his squatting body up and down, forward and backward, or side to side.
Some males stick out their chest, and some stoop forward while they are displaying.
Their hands are extended and moved in any direction according to individual preference, upward, sideways, and, most often, forward, as if to beckon the female. If the female does not respond to this first form of courtship display, the male often changes to a second form of display. He approaches the female, sits or stands bipedally, and extends his hand, lightly touching and then releasing her head, shoulder, back, or knee. His body slowly moves forward and back and side to side. One male moved his body violently up and down in the first display form, but when the female approached, he slowed his movements and touched her body cautiously and gently as if touching a fragile article.