What Causes Legs Odor With Wetness?

I am not over weight am 43yrs old and have no STDs. I have recently been suffering like a BO in the creases at the top of my legs though i beth daily. I can be soaked within seconds of getting dry. I have tried feminine washes and talcs but nothing helps. I have started a new relationship and because of this problem have not had any sexual contact yet....help please, Cat66.I am on contracetive pill have been on same one for aprox 18mth Celeste