One of the example which we got in our course is Spermicidal lubricated condoms which are are special condoms that have an added lube to it. The lubrication used is a spermicide, a substance that can destroy sperms. It follows then, that when this special type of condom is worn, the user gets twice the protection.
The lube element present is a spermicide which kills or damages the sperm. This is a combination device which is used to prevent pregnancies. Spermicidal lubes are gels which consist of chemical called nonoxynol-9. This chemical acts as a vaginal lubricant also.