In the impression of many people, circumcision (i.e., the surgical removal of the foreskin, commonly known as circumcision) seems to be the "patent" of...
The fallopian tubes play an extremely important role in natural pregnancy. They transport sperm, collect eggs, and transport fertilized eggs into the uterine cavity....
For today's boyfriend and girlfriend, their minds are constantly open, no longer as closed and conservative as before. Even without marriage, cohabitation may still...
