The social experiments I am referring to originated because people worried about increasing population that became hard to control to people in power. The fear of Malthusian crisis originated from England and spread through every western educated person, which for non-western countries like Japan literally meant aristocratic nobles. This coupled with industrialization and militarization of Japanese society required use of female work force and so policies were put in place to take them out of the house and freedom to divorce/remarriage was given as carrot. Here is an article from 1930 discussing this same issue:

"The old idea that the marriage of young people should be made by the gods with the assistance of their parents seems to be well-nigh completely discarded... While the young men's ideal of what their wives should be still seems to be a pretty woman with a classical face, backed with rich parents, the young women's fancies are more rational and more practical... 'as illustrated in most modern Japanese novels, which are generally brought about by the worthless character of parent-chosen husbands.' The young women seem to think that all the men who count at all are self made men."

(NOTE: Nowadays women want men who think marriages are made in heaven while they enjoy full freedom to break it as they please with monetary incentives. :D)

As "Mother's Educational Level Influences Birth Rate"[2], and since males are two times more likely to cause their own deaths after a divorce than females are[3], drop in population and increase in male suicide ratio can be very well be predicted, if anyone ever cared. Unfortunately men are generally more prone to suffer from hypertension and depression than women so that contributes even more in male death. [5]

To be very very on-topic, "blue lights" might save more men in USA than Japan as per following study:

"The gender ratio of suicide rates was higher in the United States (3.9) and Australia (3.3), where gender differences in suicide methods were more prominent, than in Korea (1.8) and Japan (2.7)."[4] Here gender ratio refers to people who are effected by gender differences in suicide methods.

Further more, the lowest gender ratio in suicide in Japan was back in 1990[6], "when men accounted for “just” 61.6% of suicides." After that divorce rate skyrocketed.[7][8]

This might look like a conspiracy theory to people who have never read a single thing about it, but to corraborate one of these links notices that while most divorces before WWII were initiated by men, it is now women who lead the numbers. And to people who use double quotes around men's rights and think it is some sort of American cult of misogynists - two things: 1. I don't pity you, but I will when one day you will need it. In my experience Feminist men get f*cked the most. 2. Here is a men's right organization in Japan working under the banner of conservatism to survive in a place which is under tremendous pressure from UN to reform alimony laws so more money is put in the hands of women. "Japan's 'Chauvinistic Husbands' save marriages"[9]

I suppose I haven't actually talked about the experiments. In my defence, all the research leads to cause of female suicide and the book I was going to quote is lost in my emails (I had it scanned). I will update here when I find it. What I wanted to refer to was the systematic implementation of eugenics from "Oriental Studies department" of so many universities in Europe (Sweden practiced it as late as 1984 AFAIR, with 80% of victims of forced sterilization being female.), importation of western laws following one after the other fad, systematic discouragement of study on male condition etc.

1. Divorce in Japan - Yasu Iwasaki - American Journal of Sociology - Vol. 36, No. 3 (Nov., 1930), pp. 435-446

2. http://www.earth-policy.org/data_highlights/2011/highlights1...

3. "The different impacts of socio-economic factors on suicide between males and females". Obesity, Fitness & Wellness Week. 14 August 2010.

4. Gender ratio comparisons of the suicide rates and methods in Korea, Japan, Australia, and the United States. Hee Ahn M1, Park S, Ha K, Choi SH, Hong JP.

5. Sex differences in blood pressure levels and its association with obesity indices: who is at greater risk. Gupta S1, Kapoor S.

6. http://en.rocketnews24.com/2015/01/17/2014-suicide-rates-in-...

7. http://factsanddetails.com/japan/cat18/sub117/item616.html#c...

8. Divorce in Japan: Family, Gender, and the State, 1600-2000, Page 145.

9. http://www.sfgate.com/news/article/Japan-s-Chauvinistic-Husb...

PS: I found a very good tool for while researching on this topic: http://databank.worldbank.org/data/reports.aspx?source=283 There is some surprising (lack of) data there.