Suggestion: If you're corrupted enough, then there's a chance of getting noticed while watching someone shower and/or you can choose to go in and have sex with them.
I got another suggestion! Maybe if there's a family member somewhere, not just the parents at the beach but other things like the dad at the bar, you can interact with them (and possibly have sex)
I also found a bug! When you're looking at your stats, it doesn't say your relationship with the bro (haven't tried sis yet) nor his corruption.