Yes, exactly like that. I even have already a entire Nat/Carl/Ethan scene set in my mind and involve both Ethan and Nat teaching and show him the wonders of sex. And this way Nat can even start develop a taste for "young and shy fresh meat" and Ethan support it finding funny that his wife become a cougar
. And by the Nat's side, she can start find funny in turn her husband in a bull/stud by sharing him with other girls too.
The great thing about this game is that the same event can play out differently in different routes. Like you said, in NTR/Cheating, she go to the frat party behind Ethan's back to meet the Jock, Carl or both. In cuck, she can go with or without Ethan's acknowledgement to seek other bulls and tell him later. And in the vanilla/romance she go with Ethan's incentive to help Carl, so she go to show off with Carl and just teasing/rubbing in the jock's face that she rather be with someone like Carl than with him (and this also can kick in her new exhibitionist kink). And during the party she and Carl bonding even more and the next step could be Carl meeting Ethan and the three making something together.