Final answer:
A diaphragm should be left in place for at least 6 hours after intercourse to prevent pregnancy. It is a barrier method of birth control that needs to be used with spermicide for extra protection.
Step-by-step explanation:
When educating a client about the use of a diaphragm for birth control, it is recommended that the diaphragm be left in place for at least 6 hours after intercourse to ensure efficacy in preventing pregnancy. Diaphragms are barrier methods that function by blocking sperm from entering the cervical canal. It is essential to also apply spermicide to the diaphragm before insertion to provide extra protection against pregnancy. While diaphragms can be effective, they should be used with caution because they do not protect against STIs and could increase the risk of urinary tract infections in women.