I just learned that anything sexual activities done unmarried is mortal sin in the eyes of god. and to become mortal it has to comply with 3 rules: Grave, knwoledge, free will to become mortal.
At the time I had oral sex with my girlfriend, I knew it was a sin, but didnt know this act is MORTAL SIN. Didnt even know the difference between mortal and a regular sin. So, was it mortal or venial sin what I did?
For example: if someone steal a car, of course he knows stealing is critical and wrong and of course everyone knows everything done bad is sinful, but the person doesnt know that stealing is a mortal sin, and he just saw it as anyother sin. Was stealing the car venial because he didnt know what mortal sin is??