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The Menstrual cycle

The Menstrual cycle. Female mammals: estrous cycle (fertile and in heat). Humans & other primates: menstrual cycle. Menstrual cycle vs estrous cycle. Menstrual cycle: fertile only on a cyclic basis receptive to sex at any time but can only be pregnant at certain times

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The Menstrual cycle

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  1. The Menstrual cycle • Female mammals: • estrous cycle (fertile and in heat). • Humans & other primates: • menstrual cycle.

  2. Menstrual cycle vs estrous cycle • Menstrual cycle: • fertile only on a cyclic basis • receptive to sex at any time but can only be pregnant at certain times • fertile period is not synchronized with sexual receptivity. • Estrous cycle • fertile and heat only at certain times. • Sexual-receptiveness towards males and fertility are synchronized.

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