Thank you! Yes, in the current version of the game you can hook up with Julian and have a hookup-adjacent encounter with Owen shortly after. The teachers will have hookups in a future update.
To get to the scene with Julian & Owen, head to the frat party on your second evening at school and make sure you interact with Julian at some point. At the end of the party, he'll ask you to help him get upstairs and the story will proceed from there.