As a rule of thumb I usually make sure to save a file before sex scenes with the girls I like just in case they aren't repeatable or if they're RNG based. Got saves for the threesome with Morgan's mom/aunt, Nesrot's reward, Maria's kitchen scene, choice of hooker for Charles' quest, and a couple others. You can make kinda a pseudo-gallery by constantly saving your favorite scenes. The only significant checkpoint I missed was Sarah's first time scene but I'll probably circle back and make a save state for that when Shasha get's content.
Excited for the update in a couple days though. Here's hoping we get some good scenes from the Gigolo job.