In human sexuality, making out is a sexual euphemism of American origin ating back to at least 1949. It covers a wide range of sexual behaviors, and means different things to different age groups in different parts of the U.S. It typically involves kissing, including prolonged, passionate kissing (also known as French kissing), intimate contact, including heavy petting-that is, skin-to-skin contact, or other forms of foreplay, even up to and in some usages including sexual intercourse. Making out is usually considered an expression of affection or sexual attraction to a current or prospective sexual partner. An episode of making out is frequently referred to as a make-out session.