Douching is the rinsing out of the vagina with a solution, such as
water and vinegar. Douching is not a method of birth control. In fact,
doctors recommend against douching as a way to prevent pregnancy.
Douching is not effective as a method of birth control because
sperm are extremely fast swimmers - hundreds of thousands of them
can reach the uterus before a girl even begins to douche. In addition,
the pressure of the liquid squirted into the vagina can even push
sperm into the uterus. Also, by douching, a girl can increase her
risk of contracting a sexually transmitted disease (STD).
Most women douche in an to attempt to cleanse the vaginal area.
But even this is not a good idea. The vagina has its own natural
cleaning system that flushes out bacteria. So not only do the chemicals
and perfumes in feminine sprays and douches not help, they can actually
cause problems like allergic reactions or infections in the vagina.
For more information, read these articles:
Birth Control Methods: How Well Do They Work?
The Deal With Feminine Hygiene