Just to say my part in this, I dont think Sauron thought of sex at all.
I think he didn't have spare time at all either. There was always something to do for him. With his ring being lost I'm sure he would never rest. It seems like Melkor only took time off to gloat and laugh at those puny elves when he was in full power and felt totally secure. Sauron never felt secure without his ring because he always thought it would be used against him or it would be thrown into the deep seas and he would not see it again for ages.
My 2 cents.
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Son of Isildur.
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