If she has asked you to stop, ten you should. If however, she does not insist and knows you enjoy it, then it's probably ok.
I love sharing my wife's pics and talking about her body with other men. She knows it and is happy that it brings me pleasure. She admits to getting wet when she sees the comments and imagines so many guys wanking off to her. Difficult to be very accurate, but I estimate she has been viewed at least 200,000 times across various websites. The thought of maybe half of those being unique visitors - staggering 100,000 men my have seen her and masturbated to her. At a conservative estimate of 1/500 of them resulting in ejaculation, that amounts to perhaps a litre of semen being released over her photos and videos. I have told her that and she finds it part hilarious, part wonderful to think of 200 penises ejaculating over her pics and videos.