Yes, untreated gonorrhea can cause infertility in both men and women. In men, gonorrhea can cause scarring of the epididymis, which can lead to a blockage of the tube that carries sperm from the testicles. In women, gonorrhea can cause pelvic inflammatory disease, which can lead to scarring of the fallopian tubes and infertility. It's important to get treatment for gonorrhea as soon as possible to reduce the risk of infertility.