A lot of men are incel in japan. I’ve reads 25% of adult men are virgins but I’m sure it’s a lot more. Reasons?
Jap women are hypergamous as fuck. They’d rather fuck a gaijin Chad, a yakuza thug, or a politician than a regular sarariman working 12 hours a day.
Prostitution and porn are not that big a deal; I don’t know the exact numbers but it’s not in common for local women, at some point in their lives, to have worked as a hooker or have taken a porn actress job. Japanese guys are aware of this, and (understandably) have low trust in women and would rather just bow out of relationships (can you blame them???)