OZ Magazine No.29 (1971) is one of the most iconic and controversial issues from the UK underground press, built around the theme “Female Energy.”

The cover parodies commercial detergent advertising, replacing a familiar household‑product layout with overt sexual symbolism. The oversized “OZ” logo dominates the design, surrounded by graphic white splashes mimicking detergent foam.

The slogans read:

“Female Energy”“Drives Out Stains – Washes Whitest Ever”“Recommended for Washing Machines”

The visual joke is deliberately crude and confrontational. By merging sexual imagery with domestic advertising language, OZ attacks consumer culture, gender roles, and the sanitisation of desire. The issue reflects the magazine’s strategy during this period: using mass‑media visual codes and turning them inside out through satire and provocation.

This is the infamous “Female Energy” issue, widely associated with OZ’s obscenity prosecution era. It sits alongside OZ No.28 (Schoolkids OZ) as one of the magazine’s most historically significant releases, marking the point where underground satire collided directly with British censorship laws.