One of the methods based on creating a barrier to the passage of spermatozoa is the use of a soft rubber dome-shaped cap with an elastic rim that abuts against the vaginal arches and closes the access to the cervix. It prevents conception on the same principle as a condom, does not allow sperm to penetrate the cervix and fertilize the egg. It is usually used together with sperm-destroying agents since sperm can leak around the rim.
Such a cap can be introduced 6 hours before sexual intercourse, that is, you don’t have to worry that “the moment will be spoiled”, but you should plan to use it. Do not leave the cap for more than 12 hours. Removing too quickly increases the risk of becoming pregnant. Your doctor will give you the necessary instructions.
When used with substances that destroy sperm, caps reduce the likelihood of transmission of diseases, including inflammation of the organs in the pelvic area. They also protect against cervical neoplasia, a disease that is often associated with the development of cervical cancer.
These caps can be just as effective as birth control pills, but only if used correctly and regularly. Thus, one study showed that older married women who used caps for more than five years became pregnant in only 1.1 out of 100 cases. However, for young married and unmarried women, the number of pregnancies was 21 percent in the first year and 37 percent in the second.