To me it was a lot more trouble then it was worth. Alex for the most part ruined it with his alcoholic limp dick probabilities and then of course his shining moment of striking Anna like the SOB that he is. Then, as hot as the brunette is, she can't fuck very well. All she did for the most part was lay on her stomach like an inanimate object. The guy was ready to go and easily got hard, but was a bit over ambitious to be with Anna and it showed. He seemed to only do things with his girlfriend as a means to get to Anna. The love for his girlfriend was lost in the lust for Anna. Anna, as always, was the star of the weekend. She is always the spark that lights the fire.
But here is the problem! These foursomes are a buzzkill for the viewer if intercourse swapping is off the table. Sorry, it just is! Like you, I'm happy for what I can get, but without the sex swapping something is missing. The anxiety for the viewer to see the swap, outweighs the all the rest. And for the tenants it results in an ackward situation where the guy doesn't known where or when is he allowed to cum.
Anyways, I enjoyed watching it with my CC friends nonetheless.