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).
What Caused the Opium Wars. 29 Jun, 2012 what caused 1. The Opium Wars, also known as the Anglo-Chinese Wars, were two separate conflicts that occurred between the Qing Dynasty in China and the British Empire. Both wars were the climax of disputes and tensions over trade and diplomatic relations between the two powers.