According to Michael Flocker's 2003 bestseller, The Metrosexual Guide to Style: A Handbook for the Modern Man, the trendsetting male icons of the 21st century must combine the coercive strengths of Mars and the seductive wiles of Venus. Put simply, metrosexual men are muscular but suave, confident yet image-conscious, assertive yet clearly in touch with their feminine sides. Just consider British soccer star David Beckham. He is married to former Spice Girl Victoria “Posh” Adams, but his combination of athleticism and cross-dressing make him a sex symbol to both women and men worldwide, not to mention the inspiration for the 2002 hit movie Bend It Like Beckham. Substance, Beckham shows, is nothing without style.

Geopolitics is much the same. American neoconservatives such as Robert Kagan look down upon feminine, Venus-like Europeans, gibing their narcissistic obsession with building a postmodern, bureaucratic paradise. The United States, by contrast, supposedly carries the mantle of masculine Mars, boldly imposing freedom in the world's nastiest neighborhoods. But by cleverly deploying both its hard power and its sensitive side, the European Union (EU) has become more effective—and more attractive—than the United States on the catwalk of diplomatic clout. Meet the real New Europe: the world's first metrosexual superpower.

Metrosexuals always know how to dress for the occasion (or mission). Spreading peace across Eurasia serves U.S. interests, but it's best done by donning Armani pinstripes rather than U.S. Army fatigues. After the fall of Soviet communism, conservative U.S. thinkers feared a united Germany vying with Russia for hegemony in Central Europe. Yet, by brandishing only a slick portfolio of economic incentives, the EU has incorporated many of the former Soviet republics...