1 Preseed maintains this alkalinity while other vaginal lubricants tend to have pH values below 7.0 and as low as 3.5 (very acidic and deadly to sperm.  Osmolality Ã¢â¬â Semen has a specific particle concentration that keeps sperm motile and healthy.
Causes of instantaneous or sudden death. Instantaneous or sudden death may result from dysfunction/abnormalities of the heart and its vessels, noncardiac vessels, pulmonary system, and central nervous system (CNS).
Sudden rapid, irregular and chaotic heartbeats may be a sign of a common heart rhythm problem called atrial fibrillation (AFib). Rarely, passing out, or Fainting, may be caused by the most dangerous arrhythmia, ventricular fibrillation (VF). VF is the number one cause of sudden cardiac death.