http://www.aasect.org American Association of Sex Educators, Counselors, and Therapists (AASECT)

http://drDrew.com Dr. Drew

http://www.goaskalice.columbia.edu Go Ask Alice

http://www.indiana.edu/~kinsey The Kinsey Institute for Research in Sex, Gender, and Reproduction

http://www.malehealthcenter.com Male Health Center

http://www.med.nyu.edu/Psych/screens/sdsm.html New York University Sexual Disorders Screening

http://www.menopause.org North American Menopause Society (NAMS)

http://www.womenshealth.com PMS Access/Women's Health America Group

http://www.sex-centre.com San Jose Marital and Sexuality Centre .

http://www.siecus.org Sexuality Information and Education Council of the United States (SIECUS)

http://www.talkingwithkids.org Talking with Kids

http://www.fda.gov/cder/consumerinfo/viagra U.S. Food and Drug Administration/Viagra