The porn video tag "shemale-sucking-cock" is a description for a specific type of adult content. In this context, "shemale" refers to a transgender woman with male genitalia, also known as a male-to-female (MTF) transsexual or a transvestite. The term "sucking cock" indicates that the action taking place in the video involves oral stimulation of the male genitals by the shemale performer. This video would typically feature a scene where a male partner is engaging in oral sex with a shemale performer, who may also have female breasts and be dressed in feminine clothing. The focus of this particular tag is on the specific combination of gender identity and sexual activity, catering to the interests of adult viewers who enjoy these types of scenarios