I think he means nipple pins and how much agony he could cause by useing dull ones.
Myself I have never been one to mar a good set of titties... I just enjoy them too damn much to ruin them.
This sort of reminds of George Carlins "Seven words you cant say on TV"
SHit, Piss, Cunt , Fuck, Cocksucker, Motherfucker and Tits... Why Tits, tits shouldnt even be on the list... Tits sounds like a snack food... New from Nabisco; Chesse Tits, Corn Tits, Rice Tits, Potato Tits... Bet you cant eat just one!!
For you young folks out there if you havent heard that comedy skit yall should google it. Extremely funny stuff.