Photo erotica offensive? I don't think so! It is almost as good as the real thing, well I did say almost. The variety of different bodies out there, all those curves. The different looks, textures and wow look at how the light falls on her hair! I can't afford to pay for the model to come and pose for me so I use photo references. Some of the references can also trigger that extra little bit of inspiration. Don't copy the photo exactly, just use references for their face, put them in a different situation, dress them or undress them. Put some of yourself into the image (some of the models I have seen I would like to put myself into!!) What I meen by this is, something caught your attention when you saw the image in the first place, work on it and build upon it, bring it to life with your feelings. Offensive is an emotion and without our emotions we would not be artists. For you to have taken offence, then the artist may have achieved what they wanted to achieve? You are after all discussing what you saw. What more could an artist ask for?