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Rops' biography suggests he got on well with women and enjoyed sex and had no time for Catholic morality. Many of his illustrations pushed blasphemy about as far as you could go at the time, so none of these were made public, but they are striking in their frankness. Now they are all over the Internet. While building a career in conventional illustration in Namur and Paris, he also consorted with kindred spirits in the Symbolist and Decadent art movements such as Baudelaire and Mallarmé and illustrated their works.
Below is The Temptation of Saint Anthony from 1878, in which a Rubinesque Eros has pushed Christ off the cross, which pretty much sums up Rops' life. Saint Anthony the Great (c 251–356) was known as one of the founders of early Christian monasticism and here he just looks horrified, not tempted. Flaubert was fascinated by him, which is probably how Rops got interested in the subject...
My favorite Rops illustration is below: Satan Sowing Seeds from his Les Sataniques series (1882). Looks like that's Paris down there and he's dropping sexy women. Love the clogs. One of them seems to be on Notre Dame.