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Men of the time were "lovers of pleasure" and were pretty much indulging their "ungodly lusts" all over the place. The Roman Empire of the time was rife with all sorts of sexual activities that would make most adult webmasters blush. Man/boy sex, regular rape of slaves (including children), temple prostitution, etc. If you can imagine it, they were doing it (not just jerking to images of it). Abortion got you down? Well, the ancients seemed to prefer full-on infanticide. If a baby was born and there was anything at all wrong with it, they would expose it or drown it. This was commonplace. They were pagans, so they didn't believe it was wrong. It was all out in the open (and legal). Modern society is far more conservative sexually (yes, even with the internet) than the ancient world was. It doesn't even begin to compare.

As far as the "knowledge increasing" prophecy in Daniel, that's the easiest kind of prophecy to make. If a "prophet" has even the slightest understanding of history and the world around him, he knows that civilizations generally advance over time. He would notice that each generation tends to have better tools, technology, and understanding of science than the previous generation. This would certainly have been true of the author of Daniel, who had to have been aware of the Greco-Roman civilization's brisk ascent up the ladder of progress. So, if I were to make a prophecy saying that, sometime in the far future, mankind's knowledge will be greatly increased, does that make me a divinely inspired prophet when it comes true?