Chlamydia can lead to all of the following

Not sure if this was supposed to be a multiple question, but chlamydia leads to many fatalities. In women, chlamydia can spread to their uterus and fallopian tubes, the tubes that carry fertilized eggs from the ovaries to the uterus. In men, symptoms are more difficult to spot, but they can lead to epididymitis, an infection of the tubes where sperm matures in the testicles rather than the epididymis. Men and women alike with chlamydia may result in infertility. 

So you and your partner don’t get sexually transmitted diseases and so your partner doesn’t get pregnant