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Sex manuals usually present a guide to sex positions. In the Graeco-Roman era, a sex manual was written by Philaenis of Samos, possibly a hetaira (courtesan) of the Hellenistic period (3rd–1st century BC).
Some of the positions below are popular positions for sex during pregnancy. It may be penetrative or non-penetrative, and may take place before, during, as, or following intercourse.
Men and women are typically fertile during puberty.
Though certain sexual positions are believed to produce more favorable results than others, none of these are effective means of contraception.
Different sex positions result in differences in the depth of sexual penetration and the angle of penetration.
Many attempts have been made to categorize sex positions.