My fiance's period is 2 months late. she is still a virgin and has not had sex. so why is he period late?

Late Periods: There are a number of reasons and health conditions that lead to irregular menstrual periods. These can range from stress, to malnutrition, medication side effects, and genetics. I do not know her age, but regardless of her virgin status she needs to have a good health provider. She needs vaccines to prevent cervical cancer; she needs to know all the basics of fertility and periods.

Uncertain: Reasons for missed /late periods: low body weight, obesity, marked weight gain or loss, over-exercise such as in endurance athletes, stress, illness, eating disorders (bulimia or anorexia), travel, hormone irregularities, drug use, medications (i.e., birth control) or med problem (polycystic ovary syndrome or Asherman’s syndrome.

Hormonal imbalance: Menstrual irregularities are not uncommon and anovulatory cycle is a common cause. If you miss more than two periods it would be time to see your doctor. If you do not wish to be pregnant, use contraception all the time. You may consider implanted contraceptive or an IUD. Consult this site for more information on this topic. http://www.nichd.nih.gov/health/topics/menstruation/conditioninfo/Pages/causes.aspx Practice safe sex, if you have sex. Get HPV vaccine