Naughty or Nice

Some words are nice, some words are naughty
Some are okay, some are too bawdy
Naughty or nice, here's my advice
Before you speak, think twice
Some words are dandy, some are too randy
So I've supplied a handy guide for us
My Naughty or Nice, virtue or vice, cheap-at-the-price
Thesaurus
Richard is nice, dick is naughty
Puncture is nice, prick is bawdy
Galas, dances, perfectly clean
Balls? Obscene
Doorbell's nice, knockers? Naughty
Doggy is nice, pussy? Bawdy
Nail is right, but screw is wrong
You can say ding, but you can't say dong
Donkey is nice, ass is naughty
Story's okay, but tail is bawdy
You can say sparrow, but you can't say tit
Quick as a wink, but not lickety-split
Boob is nice, boobs? Naughty
DJ's okay, but BJ? Bawdy
Construction? Yes, erection? No
You can say ha, but you can't say ho
O is nice, P is naughty
The toe is nice, but the finger is bawdy
Lobster's okay, but crabs? Ew
Grab is fine, but snatch is taboo
Grassy is nice, woody? Naughty
Cashews are nice, nuts? Naughty
Paul is fine, Peter's over the line
You can say sixty-eight, but not sixty-nine
That's my thesaurus, the end of my rap
Now you can give me applause
But please don't give me the clap