The simple version of Freud's developmental theory thus contains three successive phases: first is an oral phase during the first two years of life, when the oral sensations of pleasure are dominant. When the mother breast-feeds the child, the child experiences oral pleasure and subsequently sucks his or her finger in order to recover this pleasure. The nature of the breast-feeding determines the kind as well as intensity of oral sexuality. Second is the anal phase, in the third and fourth year, when the pleasurable sensations of the intestinal zone dominate. Anal sexuality is primarily linked to the pleasurable excitation arising through defecation and rectal hygiene and secondarily linked to pleasure associated with playing with excrement. Third is the phallic (infantile genital) phase, during the fifth year, when the genitals become central, though they are still lacking any procreative function. During the so-called latency period, which lasts until puberty, sexuality is less apparent, as its immediate expression is repressed or sublimated.