Good question. The only ones I know are BBBJ, which means Bare Backed Blow Job (sans condom), and GFE, which means "girlfriend experience."

And I think BBBKCIM should be BBBJCIM (BBBJ Cum in Mouth)
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"All my years in p*rn didn't quite prepare me for childbirth. I mistakenly thought all the stretching I did would make this easier."