Sexually transmitted infection - Wikipedia
en.wikipedia.org
A sexually transmitted infection (STI), also known as a sexually transmitted disease (STD) or venereal disease (VD), is an infection that is spread by sexual activity, especially vaginal intercourse, anal sex, oral sex, or sometimes manual sex. [1][5][6] STIs often do not initially cause symptoms, [1] which results in a risk of transmitting ...
STD valuelist
www.sorcerer-td-values.com
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Sexually transmitted diseases (STDs) - Symptoms and causes
www.mayoclinic.org
Vaginal or anal sex with an infected partner who isn't wearing a condom (latex or polyurethane) greatly increases the risk of getting an STD. Condoms made from natural membranes aren't recommended because they're not effective at preventing some STI s.
Standard deviation - Wikipedia
en.wikipedia.org
Standard deviation may be abbreviated SD or std dev, and is most commonly represented in mathematical texts and equations by the lowercase Greek letter σ (sigma).