In his 1998 book "Masculinity and Femininity: the Taboo Dimension of National Cultures", Dutch psychologist and researcher Geert Hofstede wrote that only behaviors directly connected with procreation can, strictly speaking, be described as feminine or masculine, and yet every society worldwide recognizes many additional behaviors as more suitable to females than males, and vice versa. He describes these as relatively arbitrary choices mediated by cultural norms and traditions, identifying "masculinity versus femininity" as one of five basic dimensions in his theory of cultural dimensions. Hofstede describes as feminine behaviors such as "service", "permissiveness", and "benevolence", and describes as feminine those countries stressing equality, solidarity, quality of work-life, and the resolution of conflicts by compromise and negotiation.