A quick search shows that the UK started allowing women on submarines in 2013, and the US will be up to speed in 2016. The UK used to quote the build-up of carbon dioxide to exclude women, while the US was mainly concerned about women’s privacy. These reasons faded once new submarines were built and now the Netherlands wants to finally get women on board submarines as well — in 2025.
Why is the Netherlands so slow? The privacy issue as it relates to closed quarters and showers is still an issue because the Netherlands Marine Corps does not allow women to become marines. This also means that adapting submarines for female personnel has never been a priority. According to the link below on Dutch ships, it’s not possible to move alongside another person on a submarine without touching each other, and the Dutch marines have no interest in a women’s only submarine.
The first countries in the world to allow women on submarines were Norway (1985), Denmark (1988), Sweden (1989), Australia (1998), Canada and Spain (2000), which makes the Netherlands about a slow as a row boat without oars on the matter.