"It is very unlikely, but possible. Some people, for example, are born with HIV, which they can pass to other people later in life when they start having sex. People can also pick up herpes through casual kissing — even from friends and family. Their herpes infections can then be passed on sexually. The chances of this happening are rare, so it’s not something to spend time worrying about. On the other hand, it’s another one of the many good reasons to always use condoms when you have sexual intercourse."
"Pre-exposure prophylaxis (or PrEP) is a way for people who do not have HIV, but are at a very high risk of getting HIV, preventing HIV infections By taking a pill every day, someone exposed to HIV through sex, injection or exposure to infected blood, can keep the virus from establishing a permanent infection. When taken daily and correctly, PrEP is highly effective for preventing HIV infection. However, PrEP only protects against HIV infections and not all other STIs like gonorrhea, Chlamydia, or syphilis. PrEP also does not prevent unwanted pregnancy. Only Condoms do protect against HIV/AIDS, STIs,"