1 In contrast, Preseedâs osmolality matches that of semen and thus does not harm or damage sperm.  Viscosity â The texture of many vaginal lubricants also negatively affect fertility by inhibiting the sperm from traveling up the vagina and through the cervix quickly and efficiently.
The Civil War in Sudan was caused by religious tensions between the North and the South. The two main religions are Sunni Muslim (North) and Christians or other traditional beliefs (south).
The length of Sudan's borders is 6,751 kilometers. Border countries are: 1  Central African Republic (175 km). 2  Chad (1,360 km). 3  Egypt (1,275 km). 4  Eritrea (605 km). 5  Ethiopia (769 km). 6  Libya (383 km).