Posted on Sun, Feb. 08, 2004 As complaints of fighting and harassment surface among lesbians and straight girls, Phila. struggles to adapt rules.By Susan Snyder Inquirer Staff Writer Philadelphia high schools are struggling with a new problem in student behavior: rising tensions between heterosexual and openly lesbian girls. Nationwide, lesbians increasingly are declaring their sexual orientation and publicly displaying their affection for each other at younger ages, and Philadelphia appears in step with that trend. The phenomenon has led to embarrassing moments in some cases and physical clashes in others. Accusations of intimidation have surfaced on both sides: from lesbians...