My dad watched porn in the middle of the night when we all had to share a bedroom. Introduced me and my sister to it at an early age.
When we moved to a 3-bedroom apartment. I was kind of addicted to porn. Eventually my sister and I (10M and 9F) had sex almost every night. Mostly sneaking and under the sheets stuff because we still shared a room with a younger sister who was 6 years old.