Anonymous2: Buttholes aren't considered genitals. Technically speaking, neither is the outside of the vulva. If all you show is the slit you don't have to censor it. But if you can see anything pink, including the clitoris, that has to be censored. Same goes for the penis in its entirety.
Some artists still censor these either because they're paranoid and err on the side of caution, some do it so they can charge people money for the uncensored versions, and some are just lazy and don't want to put in the effort to learn to draw them if they can't be shown anyway. This is why hentai movies that get uncensored and released outside Japan usually look so bad--the artists never thought anyone would be able to actually see the details of what they were drawing.
Some artists still censor these either because they're paranoid and err on the side of caution, some do it so they can charge people money for the uncensored versions, and some are just lazy and don't want to put in the effort to learn to draw them if they can't be shown anyway. This is why hentai movies that get uncensored and released outside Japan usually look so bad--the artists never thought anyone would be able to actually see the details of what they were drawing.