Adding high-detail mesh items can increase your avatar's "Complexity" or "Performance Rank," which may cause lag for other users or lead to your avatar being hidden by their performance settings. IMVU Sex Codes and Poses Guide | PDF - Scribd
To understand the asset, you must first understand IMVU’s structure. IMVU is not a single game engine like Skyrim; it is a catalog of user-generated 3D products that "derive" from a base avatar. Penis Mesh For IMVU