"Sexualized behavior" refers to actions, gestures, or expressions that are intended to be or are seen as romantic or sexual in nature, rather than simply friendly or casual. Full definition
The first step in addressing sexualized behavior in children is to develop an understanding of sexual development. (verywellfamily.com)
Sometimes kids exhibit sexualized behavior because they just don't understand that it's not appropriate. (verywellfamily.com)
Parents completed the Child Behavior Checklist for Ages 2 - 3 (CBCL / 2 -3) or the Child Behavior Checklist for Ages 4 - 18 (CBCL / 4 -18) and the Child Sexual Behavior Inventory (CSBI), which assesses sexualized behaviors. (cebc4cw.org)