The porn video tag "femdom gay" is a combination of different elements that describe the content of the video.
1. Femdom: This refers to the genre of BDSM or kinky videos where females are dominant over males, both in a sexual and power play sense. It indicates that the video will feature a woman taking control in a sexual setting.
2. Gay: This term usually refers to content featuring same-sex relationships, specifically those between men. However, in this context, it could also imply that the female dominatrix is also a lesbian or bisexual, engaging in sexual activities with other women.
So, the tag "femdom gay" suggests that the video involves a woman taking control and being dominant during a same-sex encounter. It is meant for adult audiences who are familiar with BDSM and kinky content involving females dominating males or females engaging in lesbian acts.