Check out this site http://goaskalice.columbia.edu/
You can ask health questions about pretty much ANYTHING. They are run out of Columbia University, but open to everyone.
Their main topic categories are
- Alcohol & Other Drugs
- Emotional Health
- Fitness & Nutrition
- General Health
- Relationships
- Sexual & Reproductive Health
Check out their site or sign-up to get their newest questions delivered to your inbox.