"3D sex cartoon" refers to a type of adult animated content, where the characters are engaged in sexual activities and interactions. The tag specifically highlights three important aspects:
1. 3D - This indicates that the animation is rendered in three-dimensional graphics, giving it a more realistic and immersive appearance compared to 2D animations.
2. Sex - It clearly states that the content is of an adult nature and involves explicit sexual scenes between the characters.
3. Cartoon - This signifies that the animation is based on illustrative drawings or digital art, often in a stylized manner, as opposed to live-action footage.
This tag is mainly used by adult audiences who are familiar with adult animated content and are seeking for specific 3D sex cartoons to watch.