I don't believe it's EVER appropriate to glorify or promote rape. Depictions of rape as exciting, pleasurable or positive, particularly when devoid of any kind of context, is an encouragement.
Those with DevArt accounts who oppose the glorification of sexual violence, please join me in reporting the following deviation as inappropriate and misogynistic:
http://community.livejournal.com/wtf_sexism/199768.html?view=7840856#t7840856 (link towards bottom of article).
Incidentally,
wtf_sexism is a great resource for those who believe in equality feminism, because members are generally up-front about reporting on sexism against both women and men.