The porn video tag "nicely" generally implies that the sexual act or scene was performed with a high level of skill, finesse, and attractiveness. In this context, it suggests that the performers exhibited grace and elegance in their actions and movements during the scene. This tag can also indicate that the overall aesthetic or presentation of the video was visually appealing and well-executed. It is used by adult audiences to describe a high-quality, polished performance or scene within a porn video.