you had unprotected sex? it is your "other" head that i am concerned about; this was not a good decision. why would you not use protection against pregnancy? even if you were both virgins (assuming both are honest) you still have the possibility of pregnancy. if your penis is sore you will need to see a medical provider so that you can be properly examined. there is absolutely no way to blindly guess the reason for your symptoms based solely on your vague statement.
i have recently had unprotected sex and both me and my partner were virgins and now the head of my penis is irrritated