At first glance, 46-year-old Mayumi Futamatsu looks like a regular housewife. But as someone who's "seen both heaven and hell" in her two marriages, she's a woman with a mission to help all women to be happy -- through having better sex lives.
When she got married in 1988 at age 28, Futamatsu had no doubt she would be happy. After all, her husband was a hospital doctor who squarely satisfied the so-called san-ko (three highs) criteria for a "good catch" -- being tall, highly educated and a high earner.
But after they settled in Yokohama, Futamatsu soon found that, because of his hospital duties, he only came home a few days each month. Then, even though they had a baby daughter, he rented an apartment near work so he could get more sleep.