A common problem in LTRs and marriage, apparently

Mayer-Rokitansky-Küster-Hauser (MRKH) Syndrome is a rare congenital disorder that affects the female reproductive system. This condition is characterized by an underdeveloped vagina and uterus. The uterus may be small or absent and the vagina is typically shortened. People with MRKH have normally-functioning ovaries and a female chromosome pattern. MRKH occurs when a fetus is developing and is present in about 1 in every 4,500 females at birth.

External genitalia and secondary sexual characteristics, like pubic hair and breasts, develop normally. However, people with MRKH typically do not experience menstrual cycles.

Due to an underdeveloped or absent uterus, people with the condition cannot carry a pregnancy and therefore have Uterine Factor Infertility (UFI). Individuals who had the uterus surgically removed or have a uterus that does not function properly also have UFI. UFI is a previously irreversible form of female infertility that affects as many as 5 percent of reproductive-aged women worldwide.

https://www.pennmedicine.org/for-patients-and-visitors/patient-information/conditions-treated-a-to-z/mayer-rokitansky-kuster-hauser-mrkh-syndrome