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Discussion of yuri always turn to discussion about porn.
However, yuri porn is incredibly niche (despite the popularity of lesbian porn with real actresses). The majority of yuri works and yuri fanarts are cute and SFW. Yuri porn is actually very rare. For example, dozens of lesbian JAVs come out every year. By contrast, there are less than 10 yuri hentai movies in existence. When it comes to fanart, you'll see a bit more risque stuff, since the artists aren't trying to make money and just drawing what they like, but even so, it'll more often go into implying sex than outright showing it.
Anyway, my point,is, talking about yuri as a porn genre kind of misses the point, since that's only a tiny portion of the yuri genre and not it's defining characteristic.