In Attackers famous movie series "New Slave Island(新奴隷島)", several scenarios (e.g. RBD-140 New Slave Island 4 新奴隷島 第四章 君を守りたいから…) shows that the master smeared white latex obtained from a kind of tuberous roots or tuber on the girl slave's montes veneris to stimulate her. Who can tell me what it is. Thanks!