3. Unprotected Sex
can cause giardia because sexual partners are exposed without a condom. The most common way to get giardia is having oral and anal sex without a condom. Sexual partners can get other sexually transmitted diseases as well by not protecting themselves. The risk increases for giardia when having unprotected sex in a public facility like a bathroom. A public bathroom is loaded with germs from other people who may or may not have been clean.
A person may have sat on the same toilet and had giardia or another STD and when someone else sits on that toilet that exposes others to that same disease. The same thing applies to a person who just used the restroom and didn’t wash their hands because they are in a hurry to have unprotected sex with their partner. Giardia can spread even more if a person has multiple sex partners and having unprotected sex.