The most common kind of sexual behaviour involving other individuals around ages 4-5 consists of

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At ages 4-5, children are in the phase of sexual curiosity and exploration. They may exhibit their own genitals to others out of curiosity or to gain attention. This behavior is considered normal at this developmental stage and does not typically involve mutual masturbation or coitus. Feeling the genitals of the other sex may occur but it is typically not motivated by sexual arousal at this age.

The Most Common Kind of Sexual Behaviour Involving Other Individuals