How does the woman's body allow for sperm to enter egg?

Transport sperm egg. Human fertilization requires egg, sperms and opportunity. The sperm must function normally to get into egg (male factor). The woman provides the egg, provides help with transportation of sperm from cervix to end of fallopian tube and environment for fertilization. Mystery still surrounds natural fertilization and ivf tries to reproduce the natural environment. "team sport" necessary to succeed.