@volleyball20,
Please listen to those who have already replied. Using sex to put the spark back into your relationship is a losing idea from the get go. In any good, healthy relationship, sex is the frosting on the cake. It is not what makes a relationship work. It does not put a spark into a relationship for any length of time. Take it from someone who has been married for nearly 30 years. Don't be afraid to wait.
In a nut shell, if the relationship is not exciting or working without the sex, it will never work by adding sex to it.