Except it's women who file for divorce 70% of the time.
The real reason is, no-fault divorces began in 1970. Making it easy for people to bail for any and all reasons.
The 60's was the era of "free""love".
The 70's became the era of free stuff, after the free lovin.
That is a misleading statistic unless you know the reasons why. Regardless of changing times, it is still the case that more men cheat (or get caught at it) than women; therefore more women file for divorce. Judges are often more lenient with men who start "dating" and having women stay over in front of the children while they are only separated and not divorced; but will punish a woman for having a new man before the divorce is final. Times are changing, but many people still cling to double standards. If those people are lawyers, judges, pastors or in-laws, it's usuall the man whom they indulge with getting away with cheating.