BRATISLAVA, Jun 19 (IPS) - Rights groups are calling on EU leaders to act after Lithuanian lawmakers approved controversial legislation that they say makes homosexuals "second class citizens" and breaches European conventions on human rights.The legislation passed by Lithuania's parliament this week bans the discussion of homosexuality in schools and any reference to it in public information available to children. Gay and human rights groups have condemned the law, claiming it institutionalises homophobia, is discriminatory, and violates the right to freedom of expression. They say it will also make gay youths more vulnerable, as teachers and other school students will be unable to provide information to them about homosexuality, or could be afraid to help them if they are bullied or attacked by peers. They also believe it breaches the European Convention on Human Rights, and have called on members of the European Parliament (MEPs) and EU leaders to put pressure on the Lithuanian government and president, who has yet to sign the law into effect, to amend it.