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.
Revving Up Sperm Movement. For a sperm to fertilize an egg, the sperm must be mobile and swim to the woman's egg. But sperm that don't move very well aren't as likely to succeed. Their chances of reaching the egg to start a pregnancy are diminished.