Thanks for the query to hcm.
Since you mentioned that all these symptoms are after sex contact without any lubrication so may be due to .
1 Traumatic injury
as this will spontaneously heal within 5-6 days, if not sex during this period .
2 The next reason may be sexual transmitted disease , diagnosis can be can be confirmed by blood examination for VDRL
3 Chlamydia trachomatis is another most common cause producing such type of symptoms .Diagnosis can be confirmed by McCoy test.
is another most common cause .
In my opinion as I mentioned above take rest ( avoid sex till sores heal ) , still all these symptoms present consult a gynecologist and get his opinion as physical examination is very important in such type of cases.