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Information for parents or guardians of every age, including teen parents. Help with family planning and with parenting toddlers to teens.

When a body part, such as the penis or parts of the vulva, becomes filled with blood and enlarges and/or becomes more firm.

A reproductive cell, sometimes also called an egg. Ova (plural) are stored in the ovaries and released into the fallopian tubes during ovulation, and can then be fertilized by sperm cells which can result in pregnancy.

On the penis, the head of the penis. On the vulva, the external portion of the clitoris, beneath the clitoral hood.