I have to tell you that as young teen I was informed, like my peers, that any unconfessed serious sin ie, a disfellowshipping sin - would result in death at armageddon.
Consequently much time was spent in discussion about what sort of sin could result in disfellowshipping.
Masturbation?
Breast fondling?
Pussy - willy fondling?
It just went on and on. One courting couple I knew believed that anal sex was OK as it was a non-divorceable offence if performed outside of marriage so therefore obviously not a disfellowshipping offence either. No confession required!
Oral? Same thing!