Final answer:
The stage of development in which children become increasingly aware of their bodies and exhibit a heightened interest in their own genitals and those of the opposite sex is called the Phallic stage of psychosexual development.
Step-by-step explanation:
The stage of development in which children become increasingly aware of their bodies and exhibit a heightened interest in their own genitals and those of the opposite sex is called the Phallic stage of psychosexual development.
In this stage, which occurs between the ages of 3 to 6 years, the child's pleasure-seeking urges are focused on the genitals as the erogenous zone. The child also becomes aware of the differences between boys and girls and may experience conflict related to sexual desires for the opposite-sex parent and jealousy towards the same-sex parent.
It is important to note that this stage is part of Sigmund Freud's psychosexual theory of development, which suggests that personality develops during early childhood and is influenced by experiences and interactions with caregivers.