Sex in a Pan

Base:
1 pkg chopped pecans
1 cup flour
1/2 cup butter
Press into a 9x13" pan.  Bake at 350F oven for 15-20 minutes.

1st Layer:
1 8oz pkg cream cheese
1 cup icing sugar

2nd Layer:
1/2 tub Cool Whip

3rd Layer:
1 tsp vanilla
1 pkg chocolate instant pudding
3 cups milk

4th Layer:
1/2 tub Cool Whip

5th Layer:
grated chocolate on top