The company was criticized for sexualizing toys in their advertisements.

sexualizing 是动词 sexualize 的现在分词形式。sexualize 由词根 sexual（性的、性别的）加上动词后缀 -ize（使...化）构成，意思是"使带有性暗示"或"将...性化"。在句中表示"在广告中赋予玩具性暗示"的行为。