Theo ngh?a này, khoa h?c ch?n cách b?o v? s? thu?n ti?n c?a các m?i quan h? ngo?i sinh và t? ch?i các m?i quan h? b?m sinh.Lots of mattress tips, Particularly incestuous bed methods, rely on the failure of siblings (or parents and children) to differentiate one another from one other because of their mutual resemblance.Ví d? s? lo?n luân cha