Sex differences Communication 17 Language and languages 13 Sex role 12 Social aspects 7 Gender identity 6 Study and teaching 6 Men 5 Psychology 5 Women 5 Education 4 Man-woman relationships 4 Mate selection 4 Sex differences in education 4 Sociological aspects 4 Boys 3 Equality 3 Longitudinal studies 3 Academic achievement 2 Attitudes 2 Career development 2 Crime 2 Cross-cultural studies 2 Discourse analysis 2 Education (Elementary) 2 Education (Secondary) 2 English language 2 Entrepreneurship 2 Evaluation 2 Evolution (Biology) 2