Sexually transmitted infections (STIs) are infections that are spread through sexual contact, including vaginal, anal, and oral sex. They can be caused by bacteria, viruses, or parasites and may not always have visible symptoms. It's important to practice safe sex by using condoms and getting regular STI testing, as many STIs can be treated and cured if detected early. If left untreated, STIs can lead to serious health problems and can even be life-threatening. While getting tested may be dif...