I should qualify, though, that the people I know are concentrated in Boston, or NYC, Chicago, Los Angeles, or SF. THere are gay and lesbian couples in smaller cities, yet it is not as frequent as one would find in a larger, more liberal city environment,
In reality, though, one can even go back in one's small town history and probably find examples. Let's take female teachers from the early to mid-20th century ... before women's rights. If women worked, they were probably either nurses or teachers. It was not uncommon for two older (i.e. today's middle-age) women/teachers/nurses to live together both from economic necessity and for emotional security. Some of these ladies were undoubtedly in "Boston" marriages i.e. lesbian marriages...