usually if there is sexual content gated that means they intended for rest to be unlocked as you progress their story
i haven't played the latest beta though since i usually go with the latest stable version (i think i'm playing 0.51.3.1 right now)
if memory serves correct regarding naomi. after you meet her via sarah, you should be able to see her around town (this also depends on her job)
regarding the sound effects:
i think the mod team mentioned they're open to better sound effects if someone can provide copy right free sound effects for them to put into the game
lunor3 what options do you have on the right when you interact with erica? there should be something like "buy her a protein drink" and "get to know her better" i think? you also want to increase her love/sluttiness a bit (talk to her and get her to 30+ love and flirt with her until 20+ sluttiness) take her for lunch to get 40+ love and then movie night her