Sexually Transmitted Infections (STIs) are illnesses that are passed on via the exchange of bodily fluids during sexual activity.

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Anyone who's sexually active can acquire an STI, particularly people who change partners frequently or do not use a barrier method of protection, such as a condom or dental dam, when having sex.

All STIs can be transmitted via the following routes:

  • Oral sex (both giving and receiving to people of all genders)
  • Penetrative vaginal sex
  • Penetrative anal sex

Some STIs can be transmitted via other routes. See specific infection links for more information.

STIs are not spread by kissing, hugging, swimming in a pool, sitting on toilet seats, or sharing baths, towels, cups, plates, or cutlery.