ABC in 1976 -- including "The Bionic Woman" and "Happy Days."
CBS circa 1978 -- "Turn Us On, We'll Turn You On!" Wait, what? Wow, CBS was quite cheeky in 1978.
NBC in 1979: Wait, forget CBS in 1978, the Peacock was even more randy in the late 1970s. Here's a clip of fall shows from that year -- plenty of women in bikinis and shirtless guys. I guess it was the 70s.