For more information on sexual orientation and gender identity, try these websites. 

American Institute of Bisexuality

Asexual Visibility and Education Network (AVEN)

Gay, Lesbian and Straight Education Network (GLSEN) 

Gender Spectrum

GLMA: Health Professionals Advancing LGBT Equality 

GSA Network (Gay-Straight Alliance Network)

Human Rights Campaign

Intersex Society of North America

Kinsey Institute

Lesbian, Gay, Bisexual and Transgender Health : U.S. Centers for Disease Control and Prevention

National Center for Transgender Equality

National Coalition for LGBT Health

National Gay and Lesbian Task Force (NGLTF)

Parents, Families and Friends of Lesbians and Gays (PFLAG)

Safe Schools Coalition

SAGE: Services & Advocacy for LGB and Transgender Elders