The following aspects of sexual function and semen quality may affect fertility:
  • Libido: Otherwise known as sex drive, libido describes a person's desire to have sex. Foods or supplements that claim to increase libido are called aphrodisiacs.
  • Erectile dysfunction: Also known as impotence, erectile dysfunction is when a man is unable to develop or maintain an erection.
  • Sperm count: An important aspect of semen quality is the number or concentration of sperm cells in a given amount of semen.
  • Sperm motility: An essential function of healthy sperm cells is their ability to swim. Sperm motility is measured as the percentage of moving sperm cells in a sample of semen.
  • Testosterone levels: Low levels of testosterone, the male sex hormone, may be responsible for infertility in some men.