Informal/slang adjective meaning erotic, sexy, or arousing; can be risqué or suggestive and sometimes crude.
その映画はちょっとエロいシーンが多かった。
That movie had quite a few erotic scenes.
彼はエロい冗談ばかり言って周りを困らせる。
He keeps telling lewd jokes and makes people around him uncomfortable.
この雑誌のグラビア、けっこうエロいね。
The gravure photos in this magazine are pretty risqué.
子どもの前ではエロい話は控えた方がいい。
It's better to avoid erotic talk in front of children.