Materials, products and services - the Green Guide Online provides details of the life cycle environmental impacts of construction materials and components, and the Green Book is a free online database of products and services.
Spermicides are used globally for birth control, with or without condoms. As the only means of birth control, spermicides are rarely effective. However, in conjunction with condoms, spermicides are somewhat effective in birth control.
Before you insert your diaphragm, you need to coat it with a spermicidal cream or jelly -- so, if any sperm manage to get over the rim of the diaphragm, they will hopefully be killed by the spermicide. The diaphragm is held in place by your vaginal muscles.