Sexual insertion - Oshouneire

…Generally, the objects of worship for the ship spirit are a pair of male and female dolls, 12 coins, a woman's hair, and two dice for the game of sugoroku. The act of placing such an object on board a ship is called "Osei-ire," and is generally carried out when the ship is disembarked. This is determined by the tides and the day, and the shipwright places it under the mast. …

*Some of the terminology that refers to "Oshine-ire" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

…一般に船霊の神体は，男女一対の人形，銭12文，女の毛髪，双六の賽2個とされる。こうした神体を船に乗せるのを〈お性根入れ〉といい，一般に船下しのとき行われる。それは潮の満干や日柄によって決められ，船大工が帆柱のところに納める。…

※「お性根入れ」について言及している用語解説の一部を掲載しています。

出典｜株式会社平凡社世界大百科事典 第２版について | 情報