The porn video tag "transsexual-girl" refers to a transsexual female performer or character in an adult film. Transsexual individuals are those who have undergone, or intend to undergo, medical procedures to transition from one sex to another. In the context of adult films, this tag may be used to identify content involving trans women (male-to-female transgender individuals) engaging in sexual activities. This can include scenes featuring sex between trans women and cisgender men or other trans women, as well as solo performances showcasing their bodies or masturbation. It's important to note that this tag is specifically for adult audiences who understand the complexities surrounding gender identity and sex reassignment surgery.