Not only have sex-researchers Masters and Johnson's private lives evolved since the first season, the plot is now also spiced up with psychotherapy and the race issue inherent to 1960s USA.
Interestingly, as the episodes move on, the sex scenes become more and more scarce, to leave room for a deeper dive into feelings.
Aesthetically, this is still very appealing. It is also well-played and well-written.
Daringly, the authors have removed several (sorely missed!) secondary characters to introduce new ones.
Still entirely watchable, therefore! Which was a relief, as I was starting to believe drama series had no way of surviving, let alone bettering, their first season. (A phenomenon now known as the 'Homeland'-effect.)