One of the most important things gays and lesbians can do for their health is to find a gay-friendly general physician (GP). All doctors ideally should be equally well trained, but you are more likely to open up to a doctor who understands the gay lifestyle. This is vital for your health, as honesty with your physician is the first step toward treating any illness or ailment you may have -- and even toward maintaining your health if you're currently in great shape.
You can find a list of local gay- and lesbian-friendly doctors by searching gay and lesbian community resources in your area. Also search the Gay and Lesbian Medical Association (glma.org) for more information.