Does it say something about me that after reading this question I immediately jumped up - went to my CD rack and plucked out my Rauncy Business: Hot Nuts and Lollypops CD? I very nearly had it playing until I realized that I have a houseful of contractors.
However, there is nothing "possible" about the double meanings - everyone knew what the songs were really about - but since somehow they got past the radio censors (you couldn't have songs about sex at the time) they became popular.
It has been a few years since I was really into the Blues, but I do remember thinking "they couldn't possibly have gotten away with this on the radio in the 30's!"
ETA linky if you want to hear the songs (If It Don't Fit - Don't Force It is my fave):