"Gay Doctor" is a tag in adult content that describes a specific category of videos involving two or more men engaging in sexual activities. In these kinds of scenes, one or both participants are dressed or portrayed as medical professionals, typically wearing scrubs or lab coats, and often including medical equipment as props or settings.
The "gay" part of the tag signifies that the content is specifically for adult viewers who enjoy watching explicit sexual situations between men. It does not refer to a specific gender identity or sexual orientation but rather to the type of relationship being depicted in the video.