system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: In Japan, why have a large number of people lost interest in sex?
gpt
They have bad working conditions, up to 16 hrs/day, especially for young people

They have extremely poor pay for young people; their working economy is ridiculously top-heavy with pay and benefits for the aging and elderly.

Polls indicate extremely high standards among young women. A majority refuse to date guys who make under a certain salary every month, but the problem is only 5% of young men make that salary.

Extremely high rents and other high costs of living make it extremely difficult for young people to start a family. It's normal to live at home until marriage, so many are simply comfortable to live with their parents rent-free for extended periods rather than take the step of marriage.

Prostitution is a legal grey area but in practice is basically legalized nationwide. Any sexual acts other than vaginal penetration are widely available from brothels and delivery services. There are many thousands of creative, themed brothels.

Casual prostitution or "compensated dating" is common. A significant percentage of Japanese women have done this at least once.

Women's concept of sexuality is damaged due to widespread molestation and sexual harassment. A majority of Japanese women have been molested by strangers, often times on their commute to work or in their places of employment. In the 90's the government created women-only public transportation to curb this and allow women to commute to work unmolested, which were immediately filled to capacity by women seeking relief. Rape is much more common than in the US.

Obviously, men raised in a society where they feel they have free reign to assault any woman they see have a damaged concept of sexuality as well.

The men place an extremely high value on young and virginal women. Many men find it horrible to consider dating or marrying a "used" woman. There are very common attitudes that women older than 27 are past "marriageable" age. Obviously these are extremely unrealistic expectations.

Basically, many people of both genders have unrealistic attitudes and have been wounded by toxic gender relations, and their economy is so stacked against them that marriage is simply not feasible for most young people to begin with.