Without resorting to novelty tunes:

Old-time edibles that don't involve alcohol

How Many Biscuits Can You Eat?
Corn & Beans
Ida Red [even if it's not named for the apple]
Red Apple Juice
Greasy Meat [good tune, lousy title]
Sugar in the Gourd [both of them]
Tater Patch
Crow Black Chicken / Old Joe Clark/anything involving the "chicken pie" verse

Others

Wayne Hancock's "Smell that Bread"
Crabs in the Skillet

I'm not going to speculate on how many of those are actually about sex, in the tradition of old-time/country/rockabilly/bluegrass borrowing blues themes.