I think the most sexist show in US in the 70s was "Three's Company".
Brit-twist: it was an American re-do of "Man About the House" but, you know, where the chicks are hot. They might as well have designed the entire show in order to run the opening credits every week -- with Suzanne Somers at 0:21. And particularly what her chest does at 0:25. You may watch it, for science:
Did you notice that jiggle? I did... I was 14. So this is pretty much seared into my retinas permanently. I'm not really complaining here.
The show was actually described by network execs as
jiggle television.
But when you watched it, Three's Company was also secretly subversively feminist;
you I may have watched it for the jiggle, but here was a very heterosexual male actually living with two hot young women and they were friends and he never really set out to bed either of them. This was instructional to a young man.