Bareback-Trans is a porn video tag that refers to a specific type of adult content. "Bareback" means that the sexual acts performed in the video are without using condoms, which implies a higher risk of STIs and can be seen as more taboo or raw by some viewers.
"Trans" here stands for "transgender." So, this tag indicates a porn video featuring transgender individuals engaging in bareback sex. This content is primarily meant for an adult audience who are specifically interested in this combination of themes.