The cervix consists of glands that produce fluid. This cervical fluid transports sperm during the fertilization process. Sperm gets inserted into the vagina and swims in the fluid into the uterus. The fluid contains a high amount of nutrients and has a specific consistency to promote the transport of sperm. If the cervical lining becomes too thick or sticky, it may disturb the transport of sperm.
Another issue of genetic deformity or damage to the cervix, referred to as Cervical Stenosis, may develop. This may result in the narrowing of the cervix. This might create a problem in sperm transport into the uterus.