i was going to say that i have seen worst stuff on FB but theres nothing wrong with this sketch. Hardly erotic, to me is simply a study of the female human form. But a pic of some dead dude in a pool of his own blood and guts is FB acceptable.
I love the lines and intensity of your work. it's bold, expressive and you really make it your own! fantastic! keep up the great work. I especially love the woman in the top left corner, her pose is strikingly powerful even though she's leaning away from where she's facing. her left foot really gives her a solid foundation. great strength is shown there! it's great the way you pay attention to the balance of each drawing!!!