In rural populations in Mexico, the system of ideas in relation to the
reproductive cycle is built on a mestizo base, with pre-Colombian and
Western elements. The objective of the study was the analysis of conc
epts and resources related to human reproduction in Morelos, in order
to design a primary reproductive health care program. The use of ethno
graphic methods helped identify bio-cultural constructs on which the c
ommunities base their reproductive patterns. Our main research results
reveal that these populations attribute great value to the extension
of the family through descendants. Women's sexuality is directly linke
d to reproduction and blood is the supremely feminine substance. Great
importance is consistently attributed to menstruation about which wel
l-defined concepts exist in the community, where as pre-menarche chang
es are perceived as a state of bio-psychosocial maturity. Menarche bey
ond 14 years of age is considered abnormal and is attributed to an 'ex
cess of cold' in the body, therapy is usually administered by traditio
nal birth attendants. In the mythical explanations given for bleeding,
the moon plays a fundamental role, as the first rupture of the hymen
is attributed to it. A general lack of knowledge about ovulation and i
ts relation to reproduction was observed, resulting in incorrect contr
aceptive practices.