I think they think The Pill is too dangerous. Too harmful to their bodies. Hell, a Japanese friend of mine wouldn't even take her pre-natal vitamins when she was pregnant! "I don't want to swallow a PILL".
I have heard stories, first-hand, of Japanese women who have had several abortions. It sometimes seems they use it as just another form of birth control. When you do that, I think it's much worse than taking a somewhat mild hormone-altering pill. I was surprised at just how common abortion is over there. I am very pro-choice, but I don't believe it should be used as another form of birth control. It's very harmful to your reproductive organs if you keep doing it over and over again.
I can see why women don't want to have children, though. I know how that is first-hand too. My husband is not a very doting father and he's gotten to where his help with the children is very, very limited. When his sister was here visiting with her son last summer, I also saw what a hard time she has. Her son is a complete
terror, and why? Because he's left alone everyday until his parents come home, for one thing. We also found out that his father lets him do as he wishes. My husband tried to discipline him while he was here, and he would talk back to him and say "my father lets me do anything I want!". Any child who is sadistic enough to honestly try to choke his four year old cousin, at the age of eight, has some serious problems.
My husband, probably like her husband, appeared to be different before marriage. My husband always acted like he loved children, and anytime we were around children, he'd be so involved with them. Of course, as soon as we had our own, he changed. It was suddenly left up to me.
So, if most Japanese males are this way(which I think they are), you might be able to understand why the birth rate is dropping.