The legal age of consent, or the minimum age required for an adult to have consenual sex with another adult, is set at 16 in the state of Arkansas which is about average across the nation.
The age of consent in Arkansas is 14 for males and 16 for females with regard to sex between a male and female. The law is detailed in the Arkansas Code 5-14-127.
Eighteen, just as all other states. However, where and when you consent to impacts the accepted minimum age. A hidden fifteen year old can get away with anything.