There is no evidence, that constipation directly affect fertility, although it is a common symptom associated with other diseases, which may cause fertility problems, such as uterine fibroids, ovarian cancer and prostate cancer.
Uterine fibroids are benign smooth muscle tumors of the uterus. Fibroids don't seem to directly cause fertility problems. However, depending on where the fibroid is located, it can interfere with sperm reaching the egg, prevent implantation of a fertilized egg in the uterus, or block a fallopian tube.
Ovarian cancer is a cancerous growth arising from the ovary. Most women with ovarian cancer report one or more symptoms such as abdominal pain or discomfort, an abdominal mass, bloating, back pain, urinary urgency, constipation, tiredness and a range of other non-specific symptoms, as well as more specific symptoms such as pelvic pain, abnormal vaginal bleeding or involuntary weight loss. Having ovarian cancer and the resulting treatment may result in the removal of both ovaries and fallopian tubes, and the uterus, which can affect fertility.
The prostate gland is located below the bladder and in front of the rectum, so a tumor in this location can interfere with digestive functions. However, chronic constipation can contribute to an enlarged prostate by putting pressure on the gland, as well as vice versa. Chronic constipation and intestinal problems can also be an early indicator of colon cancer. For some men, prostate cancer and its treatment leads to permanent infertility. For others, treatment may stop or slow sperm production for years before it returns. In general, men who receive higher doses of radiation therapy or chemotherapy need to wait longer to regain sperm production. These men also have a higher risk of permanent infertility.