I'm surprised, this is practically uncensored. I don't get it, if you can get away with these tiny white lines that don't hide anything why doesn't everyone do "censoring" like this?
Base +8, Malenk +17, TheUnknownable1234 +6, CatgirlFanatic +7
Haha, it's a big "fuck-you-japanese-censorship". I can just imagine the artist putting these in these tiny lines and being like "there! i've censored it"
The censorship laws in Japan are pretty stupid and poorly defined so enforcement seems to depend on what mood the Japanese authorities are in. The result of this is inconsistent censorship and weird stuff like buttholes not being censored until something sexual happens to them.
Also this doujin came out in C81 so it is fairly old, since then I think it has got worse in terms of censorship. You have the lightsabre dicks now and the thing where they mosaic out the entire penis, putting a few tiny bars as censorship was acceptable back then but probably isn't now but the biggest factor is where the manga is being published since doujinshi are self-published but if you publish to an anthology you have to make sure the editor finds the censorship acceptable.