Possible Clues:

• Timekeeper involved in jet lag
• What jet lag messes with
• Wound that may affect fertility?
• Jet lag is a disruption of this
• Natural timekeeper of one planning a family
• Concern in family planning
• Inbuilt mechanism regulating living organisms' rhythms and cycles
• Natural timekeeper, of a sort
• It's wound, presumably, that may affect fertility?
• One could show a woman the time of her life