Everyone who is sexually active should get tested.
Regular testing should be done every 6 months if you are sexually active with more than one partners whether you use protection or not.
If you are in a monogamous relationship and have been tested at the start of your relationship, you don't have to be concerned about periodic testing.
Women in the age range for getting regular Paps done 21 to 69 are probably swabbed for Chlamydia and Gonorrhea as part of the Pap procedure. Ask your physician.