This cover is silly, but I'd like to clear something up.
I see the "porn" word used continually for things that aren't pornographic. Erotic, maybe, bad taste maybe (in the case of that botched cover, surely); but not pornographic.
"Porn" comes from the greek word meaning "prostitue". Pornography is describing and illustrating sexuality comparable to prostitution: deshumanizing sexuality, without sentiments or feel for the others. Yep, that cover can be seen as trying to be arousing. But, she's not stuffed with a dildo, she's not engaged in a sexual activity, and she even have some sort of clothing.
It's like these peoples over at the FR deities boards on wizard repeatedly saying Eilistraee is the deity of porn. Sheesh.
Erotism is not porn, bad taste is not necessarily porn (although the reverse is always true), and when you remove your clothings to take a bath, it's not porn neither (unless you are really wicked).