Meet the story requirements, get their sexual desire score at 100% before the next day, and they should be in a "Horny" mood the next day. If it's their church day, they'll demand service when you visit the confessional. Once unlocked, it becomes a repeatable event without having to meet the requirements.
Why do I feel nervous when the game ask me permissions to modify my firewall ?
Without adding some keys were hard to remove in regedit ...
Not playing this game !