I'm a big fan of adult content requiring a purpose to the story. v20.5 is probably the most explicit update we've seen and even then, there were reasons for all of it including feeling each other out, consent, and feelings after that opened up new directions for the story. Some people have mentioned threesomes before but that would have been such a reach to jump from clueless anxiety to threesomes. I do hate to see them all split too but it's the beginning of the end, ya know?