Thank you for your honest feedback, Revzeo! Yes, We're working on the pass through problem. Regarding the zombies, we are actually working on making them 'interactable' (NSFW) much earlier in the Church level in the upcoming updates.
In the meantime, please note that you can already have sex with the Satan statue, the Wallers, and other human characters in the game etc.. We are constantly refining the balance between the horror elements and the social/NSFW content. Please check out our latest devlog for more technical updates and the fix for the key issue. We appreciate your patience as we improve the experience!