contraceptive methods | scienceinfo.net

Why can women sterilize and still be able to stick?
Sterilization gives a high success rate, but there are some cases where the ear canal itself relapses to pregnancy.
How do doctors sterilize men?
The doctor removes 1-2cm of vas deferens and closes the two ends so that the sperm does not have a way out and drains itself.
Contraception increases the risk of breast cancer
In the New England Journal of Medicine, the authors said women