The type of sex that necessitates a blood test afterwards when the STD status of the other person is unknown--intercourse (vaginal and anal), oral sex, ...anything that allows fluids to mingle.
"Did you fuck that girl last night?"
"Just a handjob, no blood test sex."
A small piece of information. Derived from the word ken, used often in the scottish language and is synonymous with knowledge.
Person 1: "Hey I don't get this shit. How do you solve this problem?"
Person 2: "I got that one. Give me some kenlets on this assignment and I'll help you w/ that one."