Is impotence common after a chlamydia infection?

No. Impotence (erectile dysfunction) is pretty common regardless of whether you have an infection or not. I'm not aware of any link between sexually transmitted diseases and ed. However, I can picture a situation where one develops ed after having caught an std. Why? Because you're afraid to catch another one. But aside from that fear, infection doesn't cause ed. Ps always wear a condom to lower risk.