Hi, guys —
We have a friend that told us a story when she was 21 years old. She was a single woman that was having sex with a 36-year-old married man. At the time, she was a Christian and not a Catholic.
She finally ended her affair with the married man and later married a Catholic man. She joined the Catholic Church and both were married in the Catholic Church.
She asked us if she committed adultery. We told her, "yes", but, we were not 100% positive so she needed to speak to a priest.