A gold star lesbian is a lesbian who has never slept with a man and wouldn't intend to. Shane McCutcheon from the popular LGBT series from 2004-2009 had claimed to be a gold star lesbian. Gold star lesbians aren't made to shame lesbians or bisexual women for who've they slept with it is simply a term for those who have not and wouldn't intend on sleeping with men.
alice from the L word: I hear the wedding bells with you already
Cameron and shane from the L word: you're just jealous because we are two gold star lesbians who have found each other