Prophets keep the people in line with God's written word. John the Baptist was faithful, even unto death. He upheld sexual morality and posterity even against the ruler of the people.

Therefore, a female led by God to prophesy would be expected to honor the same morality standards as the prophet.

The Apostle Paul taught us as to decency and order in the assembly, how women are not to teach men in the assembly. A covering is expected to be worn when a woman prophesies, and of course, the prophetess should have no continuing fornication or sin in her life. How could a woman expect to give you a faithful message of God if she can't keep her personal life and body faithful!