My houseful of brothers referred to the lone female's parts as her "bitsy-body."
A patient once came to my (gyn) office complaining of "Bumps on my cha-cha."
Musical: Have you never heard of playing the pink piccolo? Nor been admonished to keep it clean as a whistle or it won't get blown?
A personal favorite song bit that is hard to keep a straight face through is "Brennan on the Moor" which includes lines like "when Willie he went down" and "When she saw her Willie she began to weep and cry."
And Saki (H. H. Munro) has a male character, interrupted in his bath by his mother of all people who asks "What are you doing?" that he is washing "From my neck to my merrythought, and from my merrythought to my..."   I do admire the term merrythought.