The female condom (Femidom, Reality) does not cover the penis, but is worn inside the vagina. It is a transparent, odourless, thin, loose fitting sheath, almost 7 inches long, containing a flexible ring on each end.

How to insert it?
Compress the ring at the closed end of the tube with thumb and middle finger. Insert the squeezed condom in the vagina prior to sexual activity.
Push it in as far as it will go. When you let it go it rests behind the pubic bone and covers the cervix, to keep the condom in place.
  The ring at the open end stays outside your vagina. It covers the outer lips of your vulva.
Make sure the condom is not twisted.
After intercourse squeeze and twist the outer ring to keep semen inside the condom. Pull it out and throw it away.

What are the advantages and disadvantages?