A condition of the male or female reproductive system, infertility is characterized by the inability to conceive after 12 months or more of consistent, unprotected sexual activity. Male, female, or inexplicable variables can all contribute to infertility. The inability to conceive after a year of unprotected sexual activity, or six months for those over 35, is known as infertility. It can be caused by problems with one or both partners’ reproductive systems and affects millions of couples globally: