Right, this. Like their mutually-wanted sexual relationship is still so new. They started off in a very fragile state, and went through rough patches as they gradually grew closer, and with the timing in the show, they've been okay for literally weeks at a time before things blew up over the various lies of their past. And then there was the separation, and Elizabeth has been home for what, a few weeks at most in season two? Probably less than that. This is really their first opportunity where they've been through hell, finally fully committed to each other, and are in a stable place. It's kind of a natural moment for more comfort and openness with exploration to start happening.