What do Chapter 13 and 14 talk about ? Chapter 13 of Human Development Psychology: Updated Biology and Environment box on telomere length as a marker of the impact of life circumstances on biological aging ⋅ New statistics on overweight and obesity in adulthood, including international comparisons, variations among U. S. ethnic groups, and approaches to treatment ⋅ New research on substance abuse in early adulthood, including sex differences in progression to alcohol dependence ⋅ New findings on sexual attitudes and behavior among young adults, including Internet dating, sex differences in number of lifetime partners, sex without relationship commitment on U. S. college campuses, same sex relationships, and implications of sexual activity for life satisfaction ⋅ Discussion of generational differences in acceptance of same-sex marriage, including high acceptance by Millenials ⋅ Updated section on risk of sexually transmitted infections (STIs) in early adulthood, with special attention to HIV/AIDS ⋅ Revised and updated evidence on sexual coercion ⋅ Updated evidence on cognitive ingridients of creativity, including reduced inhibition of information that, at first glance, appear irrelevant ⋅ New Social Issues: Education box on the importance of academic engagement in college for successful transition to the labor market ⋅ Enhanced consideration of women's progress in choosing male-dominated careers, with special attention to college women talented in math and science.

Chapter 14 of Human Development Psychology: New evidence on emerging adults' identity development, including cultural variations in timing of identity achievement ⋅ Updated section on religion and spirituality among emerging adults, with implications for psychological adjustment ⋅ New findings on forms of love, with special attention to compassionate love and contributions of commitment to lasting intimate relationships ⋅ Updated research on cultural variations in experience of love, including arranged-marriage couples whose love grew over time ⋅ New evidence on lesbian and gay intimate relationships ⋅ Updated discussion of the challenges and rewards of parenthood ⋅ Recent findings on cohabitation, with special attention to factors linked to relationship persistence and dissolution ⋅ New research on gay and lesbian parents and their children's development ⋅ Updated findings on the challenges experienced by women who pursue male-dominated careers ⋅ Enhanced consideration of gender variations in career development, including factors contributing to the widespread gender pay gap and to differences in career advancement.