Lots of different causes, mostly related to the issues of Japanese society.
One of them is that Japanese guys and girls are separated since they're kids. You always have groups of girls, groups of guys, but very few groups of both (only for events or group dates). Even when they go out to drink, it's usually between guys after work.
Young Japanese people also live a lot at their parents place, even until 30. Basically, if they're not married, most young women will live at their parents place to take care of them. They go to work (if they work...) and then go home to help at home. Few chances for meeting guys. That's surely why they invented love hotels by the way, you can't have sex in your parents house...
Japanese people are also introverts and hate taking risks and things that are out of their habits. To meet someone, they will usually go to specific group meetings made to help them find someone to marry. If you find a cute girl in the street and try to invite her on a date or just get her number, she will be scared and flee. Everything is very controlled and traditional here, even dating. One night stands are not in the culture at all.
And most Japanese people are not very interested by sex. Even when they're dating, they don't have sex that much. Don't know why exactly, I guess they have less hormones pushing them than us. Maybe the food, maybe genetics, maybe the stress about everything, surely a bit of everything...
Other thing, they have very few, almost no sexual education. They're illiterate when it comes to sex. No idea about STDs, contraception is not always known, the pill is annoying to get... I wouldn't be surprised if a lot of them think sex=kids, and kids costs a fortune here...
I can't even blame them for finding porn a lot more convenient, Japanese society likes to make everything more difficult and annoying than it should be, and dating/sex is part of that.
EDIT: And yeah, of course, they are educated to focus on work work work, so work is the most important thing in their life for most of them. Nobody should ever take the risk of being tired at work just to go find a woman to have sex with the night before! It would be crazy, right?
Last edited by Faelco - on 17 October 2018
