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For some people, abstinence means having no sexual contact at all with a partner. For others, abstinence means having no genital contact with a partner. While abstinence may have different meanings for different people, abstinence is most commonly understood to mean not having sexual intercourse.
People may define sexual intercourse as including vaginal, anal, and/or oral sex. When abstinence is discussed as a strategy to prevent pregnancy or the transmission of sexually transmitted infections (STIs), it means abstaining from activities which put you at risk for STIs and/or pregnancy. Abstinence from intercourse does not have to mean lack of sexual expression and satisfaction, because there are so many other pleasurable things you can do.