The porn video tag "gay-redhead" is a combination of two terms.
1. Gay: This term refers to sexual content involving male participants engaging in same-sex activities or relationships, which means that this video will feature men who are attracted to and/or having intimate relations with other men.
2. Redhead: This term specifies the hair color of one or more of the participants in the video. A redhead is someone with naturally red or reddish hair. Therefore, this video may either showcase a specific actor with red hair or feature several actors with that particular hair color.
So, "gay-redhead" is describing a porn video featuring gay male action and participants with red hair.