For me, it only matters if I can tell the artist was putting themselves into the art wholesale. I'm actually shockingly vanilla, as you can probably tell from my work. Biggest radiohead fan who hates feet/scat/etc, but I love his work because you can feel the grunge being scraped off of his brainpan as he's drawing. I've seen very high quality selfsuck art that does less than nothing for me because it doesn't have the visceral love for the action like say, someone like uno makoto can display just by how he draws the creases around the hand holding the cock.