Some aspects of [Tiberius's] criminal obscenity are almost too vile to discuss, much less believe.
I will leave it at that. Suetonius goes into way too much detail for me to comfortably post the subsequent sentences here. Even Project Gutenberg saw fit to excise the worst bits from their online reader version of The Twelve Caesars. So if you ever find this passage to read, read it at your own risk.
You can't unread it. And you will never get it out of your mind.