I just went to John McCain's senate contact page to give him a piece of my mind about being the only member of the Committee on Homeland Security and Governmental Affairs to vote against
giving the District of Columbia a voting representative in the House. His website requires that you select a prefix. Among the options is "Dr. and Mrs." -- but no "Dr. and Mr." (John Kerry's site, on the other hand, does include both versions -- though despite the legalization of same-sex marriage in his state, he does not offer "Mr. and Mr." or "Ms. and Ms.")
McCain's list of issues you may be contacting him about is also incoherent. He has separate listings for "Border Control," "Illegal Immigration," "Immigration/Border Issues," and "Border Control" (again); and separate entries for "Wildlife" and "Fish and Wildlife."