You can place it any time, avoiding the need for interruption..
It’s the only contraceptive for girls which also provides protection against STD’s.
As a girl you’re not dependant on the guy: you have control over the situation.
  It protects you from pregnancy. Because it covers the outer lips you are better protected against STD’s than with male condoms.
Because it does not affect the guy’s sensitivity he may be more willing to use it.
Can be used by people with latex sensitivities since it is made of polyurethane.
Can be used with oil-based lubricants.
It’s stronger than latex.