A local legend in the fight against sexually transmitted disease, the Red Door is discreet, professional, and caring. All they want from you, in addition to a bit of blood, is a $10 donation. Counseling is available as well, along with an early intervention program--which includes blood workups and doctor referrals--for those who test positive. The clinic, which is funded by Hennepin County, also provides tests for other STDs, along with teenage family-planning counseling and referrals. Walk-in hours are Monday through Friday 8 a.m. to 3:30 p.m., with one exception: If you want an HIV test on a Monday you'll need to make an appointment.