What determines sperm health?

Sperm health depends on several factors like quantity, movement and texture:

• Quantity: Fertility is most likely when the sperm released in a single ejaculation contains at least 15 million sperm per milliliter. Too few sperm in the ejaculate can make
  conception difficult because there are fewer sperms to fertilize the egg.
• Movement: In order to reach and fertilize an egg, sperm must move – twist and swim through a woman’s uterus, reach tubes. This is known as motility. Pregnancy is possible
  if more than 40% of the sperm in the ejaculation are motile, but 40% is considered the threshold. The more the merrier.
• Structure (morphology): Typical sperms have oval heads and long tails that work together to propel them forward. It is not as important a factor as sperm count or motility.