Aprrox. 10 years or more ago, US Navy found out 19 female sailers were pregnant during a 6 months duty of a submarine in the sea.
Submarine is worse than any Navy ship such as HMAS Success. There is no place to hide in a submarine and the space is so crammed and the sailors just "go around" the entire female crew and impregnated every famale sailers many, many times over.
This kind of "sex game" can not be tolerated at all !