In the mood for some High Art?
This is "Kneeling Nun" (1731) by Martin Van Meytens
And so is this:
Alas, only the Swedes dare show this sort of thing.
If you want more nun porn of the period, you could try The Mild Punishment by Adam Johan Braun (1789):
And of course Heinrich Losslow's (1840-1897) The Sin: