
You can dislike how it turned out now, but the first five decades of the 20th century were sexually repressed to a level we can't even comprehend today, so it's not surprising there was an eventual snap in the opposite direction there was no grand conspiracy, young people were just horny and had freedom because of cars, and didn't want to be like their stuffy parents.
Yes it was made by advertisers of condom and birth control pill companies trying to increase their sales. They lobbied for legal changes to legalize porn, decriminalized cheating, and paid for fake studies that claimed that everyone was hooking up all the time so as to normalize hookup culture before it really took off