I’ve read in a few verifications that individuals are skilled in the getting mucky with each other department.
How are these skills learned and or assessed. Is there a college course or is it like a cottage industry and passed down through the generations?
If it's a couple they certify each other.
Her by him "She's got great oral skills, a tight wet pussy and is a national squirting champion".
Him by her "He's got magic fingers and is superb at oral, trust me Ladies. He's got fantastic stamina and WILL have you cumming"