The source is the 1990-1992, 15th Revised Edition of Contraceptive Technology. Authored by too many doctors to cite. However, this book is used by millions of doctors around theworld as an authority on contraception. Also, some men can feel the diaphragm during intercourse.
Some women have recurrent yeast infections when using the diaphragm.
The average diaphragm costs about 20-30 dollars, but it must first be sized and fitted by a gynecologist, so there is the cost of a doctor's fee. Must be replaced every two years to ensure correct fit and product lifespan. A tube of Gynol II costs around 11 dollars and is good for 24 doses of spermicide. The Boston Women's Health Book Collective, 1984. It has a semi-stiff plastic ring at each end.