by Donald W. Pfaff
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Civilization · Description and travel
Iberia; Spanish travels and reflections
1968
Sex · Sex (Biology)
The evolution of sex
1889
Sex (Biology) · Sex (Psychology)
Sex, gender and society
1972
Sex instruction for children and youth · Sex
Human Sexuality Today
1991
Sex (Psychology) · Sex (Biology)
The Psychology Of Human Sexuality
2013
Sex · Sexual Hygiene
Human sexuality
2008
Science · Sex (Biology)
Bonk
Sexual behavior in animals · Seksueel gedrag
Dr. Tatiana's sex advice to all creation
2002
History · Art
The story of Siena and San Gimignano
1902
Testosterone rex
2017
Sexual attraction · Sex (Biology)
How Sex Works
2009
Orgasm · Orgonomy
Entdeckung des Orgons
1942
Endocrinology · Sex (Biology)
Sex and internal secretions
1932
