How to report unsolicited sexual content on Reddit?

I have come across multiple subreddits containing posts with unsolicited sexual / pornographic content on Reddit from a specific south asian country. I am pretty sure that there was no consent of some or all of the people involved (in recording them or sharing it online). In some instances, an entire subreddit is full of such posts. Some instances also have minors (they appear to be teens and not adults) in them.

I have tried to report such posts through reddit itself but I always get a response stating that "After investigating, we’ve found that the reported content doesn’t violate Reddit’s Content Policy.".

So - how do I get the subreddit or post(s) taken down?