Young Kissing Girls

Christopher Nyrop, in his book The Kiss and its History (1901), identifies a number of types of kisses (kisses of love, affection, peace, respect and friendship), while noting that the categories were somewhat contrived and overlapping, and other cultures often had more kinds, including the French, with twenty and the Germans with thirty.
Kiss of love
Kissing, as distinct from necking (defined as kissing for a long time), is the most common sexual activity among United States adolescents, apart from holding hands (about 85 % of 15 to 16 year old adolescents in USA is reported to have experienced it).