Courtship:

Eibl-Eibesfeldt, Human Ethology:

"Scientific study of human sexual behavior is all too frequently limited to the sex act (A.C. Kinsey et al., 1948, 1966; W.H . Masters and V.E. Johnson, 1966). The ethologically more interesting phases of heterosexual contact initiative, courtship, and falling in love, have only recently been given attention (D. Morris, 1977; M . Cook, 1981; R.A. Hinde, 1984; M.M . Moore, 1985)"