So, I took advantage of the "PornHub Premium For Free" campaign and was puzzled about why they did not show me any videos with the tag "hypnosis" or "hypno" or "hypnotized" anymore. Apparently, this is due to some restrictions of credit cards companies and violates their terms and conditions.
You can still find several videos tagged as "mesmerize" and "mind control" or "brainwashed", but they are not equally popular.

Any idea on how to solve this other than logging off bevore using the site as regular member?