nine shallow, one deep (ancient Chinese sexual technique)
Refers to a specific ancient Chinese sexual technique involving nine shallow thrusts followed by one deep thrust. This is a historical and technical term, not used in everyday conversation.
Nine shallow, one deep is one of the ancient Chinese sexual techniques.
From Chinese 九浅一深 (jiǔ qiǎn yī shēn), literally 'nine shallow, one deep'. The exact historical derivation is uncertain; the term is associated with ancient Chinese sexual practices.