question: Hi. I am male and I received oral sex nearly 3 weeks ago. 2 days after the event I started to get a sharp sensation at the base of my penis (the position would be at around 10 o clock on a clock face) when the foreskin is rolled back. I am worried this may be related to an std, although I can find nothing that would have such a symptom. There is no visual signs of any problem, just this sensation. Could this be an std?