The gnostic tradition does not "prohibit" anyone from doing anything, since it is black magic to coerce others. You are free to do whatever you wish.
However, if you wish to liberate your consciousness from suffering, then it is wise to consider the nourishment you give to your consciousness. Just as we need to eat and drink the healthiest food, everything we take in through our senses is also food, but for the consciousness.
We must be careful of the nourishment that the mind receives, careful with newspapers, television, and movies [add to this all modern entertainment: games, internet, etc]. We must verbally and mentally transmute the seed with sepulchral offerings. In other words, we must not nourish ourselves with refuse, because this is worthless. Bad literature, bad movies, bad television, bad words, are rotten for the mind.