"Boy Crush" refers to a gay porn video category where the actors are typically younger or more slender men who are engaging in sexual activities with one another. The term 'crush' here can mean that the performers have a mutual attraction and desire for each other, adding an element of romance or passion to the scene. This tag suggests that the content involves a more youthful and perhaps innocent vibe compared to other gay porn categories, often featuring smooth bodies and tender lovemaking scenes.