Amazingly, all these changes are preparing your body physically to be able to conceive and bear children. However, it can take a lot longer to be able to cope emotionally, mentally and spiritually with sexuality and having children. Menstruation is the major biological process which facilitates reproduction. That is, when a girl starts to have a regular menstrual cycle it means that she is fertile and is able to have a baby. On an emotional level having a regular menstrual cycle opens a young woman to her intuition and instincts, and the world of cycles.
Nothing is ever straight down the line, or clear cut anymore.
A young woman becomes aware of the shades of grey. She may start to sense more vividly the hidden motives, thoughts and actions of others. She may start to sense a world beyond what she has experienced up until this time and that may be confusing. The biology of puberty and menstruation At the onset of puberty a girls body is flooded with different hormones. The hormones cause the changes in your body and many of the unstable feelings that you may experience.