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It would follow that women who have never breast fed, those never married, such as nuns, and those never producing a living child, would have a higher incidence of arthritis. Did anyone look at that?

This reminds me that breast cancer used to be called "Nun's Disease". More info here

What is seldom--if ever--emphasized in public discussions on preventing breast cancer is the fact that having a full-term pregnancy has been linked to a decrease in breast cancer risk--the earlier the better. A major study of 250,000 women from around the world found that those who have their first child by age 18 have only about one-third the risk of breast cancer faced by women whose first birth occurs at age 35 or later.⁽⁴⁾

Another large study published in 1989 by the Centers for Disease Control examined data from eight population-based U.S. cancer registries and found that lactation also plays a role in reducing breast cancer. The more children a woman had and the longer the duration of breast-feeding after birth, the lower her risk of developing breast cancer.⁽⁵⁾

Pregnancy and childbirth have also been linked to two other diseases that affect women: ovarian and endometrial cancer. Studies have shown that women who have never had children are twice as likely to develop ovarian cancer--which takes the lives of about 14,000 American women each year--compared to those who have given birth.⁽⁶⁾ As with breast cancer, the more full-term pregnancies a woman had, the lower her risk of ovarian cancer.⁽⁷⁾

According to the U.S. Department of Health and Human Services, "Childbearing is the most important known factor in preventing ovarian cancer, suggesting that hormones play a role in its development."⁽⁸⁾ Several studies have also shown that having few or no children is also a risk factor for endometrial cancer.⁸

In the same vein, so to speak, Frequent ejaculation may protect against prostate cancer.

"In the US study, the group with the highest lifetime average of ejaculation - 21 times per month - were a third less likely to develop the cancer than the reference group, who ejaculated four to seven times a month."

God gave us our bodies and meant for us to use them!