You made a very good observation there about people always having been as sexually adventurous
(I prefer that to "perverted") as we are today.
I still remember seeing with horrified laughter 4,000-year old clay figurines from Assyria depicting men and women in every conceivable coital pose.
In the movie "Reds" there is a great line by one of the elderly interviewees. She said "oh, there was just as much screwing around back then (in the 1920's, that is) as there is today. They just didn't talk about it so much. That's all young people today do, talk".
The exhibit you describe is a good reminder that just because we talk about it all the time, doesn't mean we're doing anything that hasn't been done before...