This is definitely an important difference.
Also men from some western countries seem to be ashamed that they “have to pay for it” because it hurts their manliness but i feel like Japanese guys don’t think like that, especially if they are bit older.
Rather, paying means you have money to spend and is a statun symbol, and you can expect good service and omotenashi, rather than with a random hookup.
Its definitely not uncommon to monger together with work colleagues here, although also not totally unheard off in the west of course.
I think this attitude is a lot more positive.
As for guys “cheating” on their wives. Most guys i have met through p4p have an (almost completely) sexless marriage and their wives actively reject them and do not want sex. So I actually think its a lot more gentle for them to go discretely looking for it outside of the home then to force themselves on their wife and demand them to fullfill their “marriage duties”.
Of course there are other options like divorce, but that may hurt the kids and ruin an otherwise functional marriage. There is also just giving up on sex, which many Japanese guys do also according to surveys, but that may leave them alone, miserable and depressed if they actually still have a sexdrive. There are real affairs that are more dangerous to get too emotional and mess up the marriage.
Best option would maybe be therapy but not all wives would be up for it and happy with the suggestion.