My girlfriend wouldnt want to have sex with me without a condom (keeps thinking of her cute replacement words for these things, nearly gets confused) so its amazing that between her time at highschool and now has changed so quickly...she's only 20
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I think the problem is many guys may think condoms numb the feeling, dull the sense down there, and then theres the problem of wipping a "jonny" out durring a pretty hot make-out session and the hassle of using it.
They need to teach girls to be more serious, to learn to say no without protection if she doesnt want it, and dudes need to be taught that condoms dont need to interfere with the feelgoods.
Secondly, this 5 sex buddies at a time thing is kinda creepy, i mean ive heard of people getting about but, when everyones sleeping with everyone else and its all casual and meaningless, its just inviting transmission of disease, not to mention teenage pregnancy (ive not really heard of this in japan, do japanese girls feel more easily capable of abortion without any emotional trouble?).
Japan has had issues with sexuality for a while though, ive never really understood the reason for violent rape like media and what-not, and in general, japan seems really big on erotic entertainment.
They should start showing movies of AIDS victims in schools, really send the message home to the japanese of what they can look forward to if these teenagers keep sleeping about, im sure in such a ussually comfy society of japan, this knida shock lessons will have some effect.