Well a little help to the ladies i guess?
There is one thing that is completely natural that prevents pregancy, that would be lactation. Women who produce milk from the breast ( the mark of a adult women) can controll their ovation, as the secreation of breast milk changes the chemical balance in the female endoctorine system preventing the release of eggs(ovum). their are other benefits from lactation such as prolonged fertility in later life. a attractive benefit as women who are in their older years go through menapause, and lose seed becomeing unable to bear children. (menapause is considered to be uncomfortable) women who lactate may not have such a exsperince and may remain fertile well after the time of menapause for other women who don't lactate. lactation results in the preservation of ovums ect... lacation also has been known to stop the menstration cycle so there is no more monthly period. and so a little more ease exist. lactation also allows a female to develope her breast for the time in the future when she has a newborn who is reliant upon a mother breast milk. practice makes perfect something to consider as some women have a difficult time breast feeding and may have to rely on baby formula(powdered milk) or another women to breast feed her infant.
Certainly the practice of lactation also allows the female something to offer her male as well for nurshiment when there is not a child, a very good change from cows milk. that he might drink.
The subject being about prevention of pregancy, lactation offers a alternative to other chemicals that in some cases have caused cancer and other probelms in female biology.
Lacation requires some attention, care for ones own body, simular to combing your hair, a daily practice. A alternating cycle of lactation is probally best, when not lactating/milking the breast a feamle should rest from daily sex, increaseing sexual activity when they increase lactation. the reason for this alternating cycle is because the female body makes a adjustment in some cases and will begin ovation while lacating, the alternation of time period of lactation and nonlactation, clears the chemical balance(amount of hormones) allowing for a normal and unconfused chemical signal from the body to other parts of the body.
A women that lactates/ has milk flowing from her breast can prevent pregancy for several years before the chemical signal become confused. but some women are not regular ectra and the confusion will occur.
Mostly it is a female adjustment from adolescence to adult womand, but also it is a social thing as well, in some cultures it is widly accepted, the drinking of human female bbreast milk, in some, mostly industrial cultrues people have no understanding of humans as indigenoous and so look down on breast milking, some women i think are jealous of others who actually have the ablity to produce quality breast milk and so cast a negative image on women who milk their breast.
breast milk can also be sold on the market so their are other benefits.
It takers a adolesecent female abotu 6 months to develope her breast in to producing quality breast milk (about a pint) and it takes abotu 3 to 4 weeks to start the milk flowing some even faster.
Their are a few more other means of controlling nature in a natural way besides lacation, and chemicals.