Avoid boozing it up together
If you’re going to try to pretend it didn’t happen and move forward as friends, avoid liquid temptation. After three drinks, everyone’s mind goes to one thing, and you don’t want to be in the vicinity of Roomie after that. Keep your boozing out of the house (San Francisco has a never-ending supply of awesome bars, after all) and go out with friends who will encourage you to flirt with that cute guy or girl at the end of the bar instead. But once you start flirting with someone new...
Don’t bring your date home
At least for a couple of months. It’s rude and hurtful, and will only make your living situation more awkward. The walls are thin, remember? If you want to have a sleepover with that bar fly or Tinder date, go to their house and hope they haven’t slept with their roommate yet.
Keep it discreet
So you want to keep up the late night rendezvous? We get it -- it’s convenient, there’s something sexy about the forbidden, and you’re already comfortable with the person. Despite advice from your friends, you’re probably not going to stop. At least make it easier on your other roommates: avoid canoodling over dishes, partnering up for steamy shower sessions (come on, some people have to work), and dragging the whole household into your drama (this means keep the flirting -- and fighting -- quiet and considerate).