It's perhaps changed since I was there last (winter of 2008/2009), but at the time it still hadn't changed much although penetration was increasing in households with teenagers/college age kids.
I would often bring porn for the men that I worked with (you'll get huge bonus points) as it was uncensored and while easily found on the internet still isn't common there. And for everyone I gave it to, at this particular company only one person had a home computer. I had to convert and burn everything else to DVD for everyone else.
And for that one person his computer was already 6 years old (and slow as hell).
Out of relatives and friends of relatives, again computers were few and far between, and internet connected computers were even fewer.
That said at least in workplace offices, internet connectivity is getting more common. But interestingly enough analog modems are still fairly commonplace in those settings. Surfing on the modern day internet is quite painful at anywhere between 24k - 44k bps.
And this was in Tokyo...where 100 Mbps FTTH is easy to get. In addtion to that NTT was running specials on FTTH (along with trying to convince you to convert to VOIP phone service.
).
Still this is much better than say 10 years ago, when noone I knew or worked with in Japan had a computer or knew what the internet was...
Interestingly enough, doing a quick search on the internet shows the Japanese Government reported numbers don't match my own personal experiences among the hundreds of Japanese households I've been to, nor the Japanese businesses I've been to... Nor does it mesh with the Japanese people I've talked to...weird. Seems to be a bit of a disconnect there.
Actually there are some things that might skew this now that I think about. Many Japanese apartments are furnished or partially furnished apartments. And most of them include a TV that is connected through the internet. So in theory every single renter in those apartment complexes has internet service although all it's used for is to watch TV most of the time.
Regards,
SB