Not sure... The Beach Boys seemed squeaky clean at the beginning of their recording career. By the time Smile and Pet Sounds came out, I think people knew about their drug taking (great albums!!!) but many who know their early work have never heard "Our Prayer" for example. I think they got their fame on the G-rated stuff and were able to push genre boundaries later. I think it's the same with The Beatles, although I'm not positive- hard to imagine a time when people were not familiar with Sgt Pepper and The White Album...
What are you talking about? They were wildly popular long before they started singing anything edgy. If anything, their popularity is what allowed some of their more unusual ideas to enter the mainstream and be accepted.
What? Early Beatles is all about falling in love and being in love. There are sexual undertones, sure, but your statement seems like pure trolling.