Sexually transmitted diseases (or STDs) are diseases that are commonly transmitted between partners through some form of sexual activity, most commonly sexual intercourse, oral sex, or anal sex.
Note that all sexual behaviors that involve contact with another person or the body fluids of another person should be considered to contain some risk of transmission of sexually transmitted diseases.
As may be noted from the name, sexually transmitted diseases are transmitted from one person to another as organisms or viruses (rather than caused by specific sexual activities). It is not possible to catch any sexually transmitted disease from any sexual activity with a person who is not carrying a disease; conversely a person who has a sexually transmitted disease got it from contact (sexual or other close personal) with someone else who had it (or from contact with bodily fluid of someone who had it).
Although the likelihood of transmitting various diseases by from various sexual activities varies a great deal, in general, all sexual activities should be considered as being a two-way route for the transmission of STDs (i.e., "giving" or "receiving" are both risky).
Types of sexually transmitted diseases and their causative organisms:
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