Ha ha ha. It's also known as the dip and sniff. I personally always "prep" for sex. I once went to the doctor for this (I thought it was an infection) and she told me that a slight musky odor can come from a simple ph imbalance (due to semen, or after your period, etc because those things have a higher ph) she recommended a product called Rephresh. You can get it at a drug store and it also is a lubricant.
drink alot of juice and water. dont drink like soda and stuff. apple and orange juice works the best. And wash before doing it