The age of consent in Connecticut is 16, so if your child is 16 or older, they can consent to sexual activity with anyone older than them.*
If your child is between the ages of 14 and 15, they are exempt from the age of consent law as long as the person they are engaging in sexual activity with is less than 3 years apart in age from them.
Examples:
14, 16
15, 16
15, 17
Under age 13, they must be less than 2 years apart in age to be exempted. To be clear, this does not mean that sexual activity at this age is appropriate; it just recognizes that prison is an inappropriate intervention.
*This is overridden if the older person is in a position of power, like a teacher, boss, camp counselor OR if they are given anything of value in exchange for the sexual activity. In any of these cases, it would be illegal.