Fact While certain infections can render a person infertile, if proper treatment is sought out within a reasonable time frame most people's reproductive systems will not be affected. This is due to behaviors and biological factors common among young people. For protection against chlamydia during oral sex on a female, you can use a dental dam as a barrier between the mouth and vulva. Likewise, people with untreated chlamydia can spread the infection to their sex partners. Young women should get tested annually. So once you are infected and have been effectively treated it is just as possible to contract the infection again in the future.