Oups, sorry ! I've only just realised that my initial question was not very clear and could be understood in 2 different ways.
"Do men talk more about themselves than women ?"
By this I mean
"does a man like speaking about himself (because he finds himself important, maybe), more than a woman would talk about herself".
I didn't mean "do men like gossipping about each others more", or "do men talk about each other a lot".
Sorry for the confusion.
In Japan, it's very clear that Japanese men like to be listened and praised by females or other (subordinate) males. I think it's in the nature of men like this. I've read
"Men are from Mars, women are from Venus", by John Gray last year and here are a few things I find particularily true and enlightening :
A man needs to feel reassured of his value all the time. He needs to hear that he is right more than a woman. Women need to feel apprieciated and respected. So, men need to be reassured about their capacities, knowledge or efficiency, while women need emotional support and feel they are useful (i.e. that their presence is desired). The worst offence for a man is to hear "you are not good enough to do that !". However, a woman would be more shocked if she was told "you are not necessary".
Personally, I tend to feel offended when someone want to "help" me with something I can very well do by myself. It feels like a supposition that I am not good enough. My wife is offended if I tell her I don't need her to help me, because I can manage very well by myself.
Interestingly, the other way round, it's no problem. She can ask me help and I am happy to show that I can help, while she is glad to be helped too. But I hate to be criticised for not doing something well enough (usually it's for unintelletual things like the cleaning, but still I feel offended because I was doing my best).
Women hate that their feeling be criticised, not so much their abilities. To all men on this forum, never tell a woman that she shouldn't feel the way she does and try reasoning her. She needs to be listened and understood rather than to find a rational solution to the potential problem. That took me a long time to understand, as I wouldn't feel better by just being emotionally supported.