How Chlamydia Spreads
Chlamydia is transmitted through oral, vaginal or anal sex. The disease does not require ejaculation to spread. Using condoms significantly reduces your risk of contracting chlamydia but if you have any concerns both you and your partner(s) should get tested.
Chlamydia's primary mechanism for infection is by spreading through infected secretions and fluids (vaginal, semen, pre semen) into sensitive mucous membranes like the vagina, anus, mouth, eyes and penis.
Chlamydia infections can be passed through shared sex toys which is why proper sex toy sanitation steps are always necessary for your sexual well being.