1. Sex Roles in Primate Relatives

2. Common Chimpanzees Pan troglodytes
Live in tropical Africa
Have estrus and menstruation
monthly
Females choose mating partners
May form consort relationships
briefly during estrus
Live in matrifocal groups
Mothers nurse for 5 years
Mothers and children have lifelong relationships
Siblings have lifelong relationships

3. Bonobo Chimpanzees Pan paniscus
Walk upright more
Use sexual behaviors to comfort or to resolve conflict
Display all types of homosexual and heterosexual behaviors
Matrifocal groups
Same lifelong mother-child and sibling relationships

4. Bonobo Male Grooming Female

5. Upright, Bipedal Bonobo Carrying Sugar Cane

6. Bonobo Relaxing

7. Bonobo Female Stretching

8. Bonobo Intercourse in Missionary Position

9. Bonobo Intercourse in Missionary Position

10. Bonobo Females “GG Rubbing”

11. Bonobo Males “Rump-Rubbing”

12. Bonobo Female Masturbating

13. Bonobo Male Display

14. Bonobo Baby

15. Bonobo
Mom and
Baby

16. Bonobo Mom and Baby Playing

17. Bonobo Matrifocal Group