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 death in young athletes is a rare but tragic event. Most of these sudden deaths are due to underlying and undiagnosed cardiac conditions. And most of the heart conditions that cause sudden death in young people could have been diagnosed with careful testing. So, it seems to make sense to carefully screen all young athletes for heart problems before allowing them to participate in sports.