question: I had protected oral sex 3 weeks ago. I have had a STI test for chlamydia and gonnerhea and the both came back non-detected. I have not had an HIV aids test yet, but i have talked to 3 doctors in person now, all assuring me that i do not have the virus. It has helped put me at ease a bit, but i am still worried. I noticed on the tip of my penis (from the urethra to the frenulum) has been getting purple and a little white. And lately my testicles have been hurting, but i think that was due to super tight pants while working the other day. What do you think about everything?