@steaphan I think nudity was much more widespread than today for sure, there were even mixed public baths (though this varied greatly over time and from place to place).
If there was more sex, I cannot say, but as my Twitter friend LJ Trafford said "there was no telly" 😉
Something that we know for sure is that nudity and especially penises were depicted on everyday stuff like on the side of a house or at the fastfood joint or on protective amulets. Check out #PhallusThursday to get an idea!