Egg Bok
More a feat of strength than a sexual act. A woman assumes the horse-stance position and inserts a raw egg fully inside her birth canal. The man (usually) sits cross-legged in front of her with complete concentration. After proper chi is harnessed, the man will strike one blow to the woman's taint (space between vagina and asshole). If this is performed correctly, the egg will break within the womb and only the yolk will ooze out, fully in tact. This is very similar to the Dim Mak (touch of death) in the hit Jean-Claude Van Damme movie, Bloodsport.
After much practice, young Methusula was finally able to egg bok his soon-to-be-bride in front of the entire village; proving his worth and skill.