Terri- Some I could guess at but would love examples. I would think the simple passage of time softens the response of today's viewers to what may have been pushing the envelope of good taste at the time of its creation.
A rather flouncy Donatello
Where do we begin with Michelangelo?
Giorgione's painting has been called the Dresden Venus for centuries... but there are absolutely no elements denoting her as the Greco-Roman goddess. She is simply a naked woman sleeping in the hills outside of Venice. Of course, the very notion of a naked woman in art (unless a portrayal of the "sinful" Eve) was taboo... and not permissible in most of Europe at the time.
Titian takes it further with his
Venice d'Urbino who is essentially a portrayal of a courtesan... a high-class escort or prostitute.
The Mannerists were absolutely outrageous... Modernists of their time challenging the status quo both in formal terms (with riotous colors and anatomical and spatial distortions) and in terms of taboo subject matter. Cupi...or Amor, by the way, was Venus' teenaged son in Bronzino's painting.
Here is the same theme by Allori.
I can't help but admire Cranach's
Three Graces pouncing and preening for the audience, like an Instagram "influencer".
It wasn't merely the taboos concerning sex... but also violence. Take this deliciously ridiculous and gory
St. George and the Dragon by the artist who was so openly gay that he took on the name Sodoma.
Or Hendrick Goltzius, one of the leading Dutch Mannerists whose prints and paintings embraced extreme violence.
And what of the sweet Rococo? These artists were models for Renoir. Yet not only would the "me too" generation be outraged by this famous
Portrait of Mademoiselle O'Murphy painted by Boucher of the French King's 14-year-old mistress... but the Rococo outraged the far more moralistic Neo-Classicists who were the immediate heirs of the Rococo. Denis Diderot, the art critic and philosopher, bemoaned the fact that Boucher and others of the era were such brilliant virtuosos... who used their skills in the service of such "decadent" and immoral" subject matter. We've seen the same sort of moralistic outrage directed at works by Picasso (of course) as well as Egon Schiele, Klimt, Balthus, Dix, Grosz, Marsden Hartley, Paul Cadmus, Tom Wesselmann, David Hockney, Mel Ramos, Lucian Freud, John Currin, Will Cotton, etc...