【李豆沙】发卡（qiǎ）？李发卡（kǎ）

欧美国家中蓝色也有“色情物”的意涵，例如blue joke和blue film

blue film ⇄ A film that contains graphic sexual content. The use of "blue" to mean lewd or indecent dates from the mid-1800s, though the origin is unclear. A lot of kids at school got in trouble for trading blue films.