This porn video tag is referring to a specific category within the gay porn genre. The phrase "gay son" can imply that the content involves a young man exploring or participating in homosexual activities. As for the "(gay)" part, it serves to further clarify that this particular video belongs to the broader gay porn category and not any other sexual orientation categories. So, this tag refers to a video where a young male character is involved in same-sex encounters, which appeals to audiences who enjoy watching gay pornography featuring younger individuals