making it difficult or impossible for her to get pregnant later on,” the CDC website reported. “Chlamydia can also cause a potentially fatal ectopic pregnancy.” Both STDs are passed by having unprotected sex outside of a monogamous. Chlamydia is treateble, but you should avoid sex during treatment. Monogamous (mutually monogamous) relationship with a tested and uninfected partner is the best way to avoid any STI, including chlamydia. She said a…