As for the current Japanese scat, pay movies is the mainstream. Around 5 years ago, there were a lot of free pics in Japan.
There are good free movies in "Otsuka" site,in the others there are not the good free movies.

http://www.ohtsuka-f.com/top/index.html

As for free movies in "DUGA" site, there is much number of articles , but viewing time is short.

http://duga.jp/rw/search/04/

If you take out more than 3 dollars (300 �~) for one movie,you can watch a lot of pay movies in "DMM" site.

http://www.dmm.co.jp/digital/video/-/list/=/sort=price_asc/article=keyword/id=4018