'The Male Intellect: An Oxymoron?' BY HEDY WEISS
Some of the most intriguing moments in Tuesday's Shubert Theatre opening of "The Male Intellect: An Oxymoron?"--Robert Dubac's "one-man, many voices" show--occurred after the actor took his curtain calls.<br /> Dubac didn't just return to the stage for a brief schmooze with the audience and, as he engagingly confessed, some shameless hawking of his CD. After some deftly controlled banter, he posed this telling questi…