It is placed under the skin in your upper arm and releases hormones that work to prevent pregnancy. Once the implant is in your arm, it works for up to 3 years.
Read more on Brook's page about the contraceptive implant.
Dental dams aren't common, so if you can't find one you can use a condom that's cut open and spread flat. Diaphragms are for women to use during sex to prevent pregnancy. They're made from a soft rubber material and are shaped like a small bowl.
Take a look at Brook's page about diaphragms to find out more about how to use them correctly and where to get them from.
Read more on Brook's page about emergency contraception.