Your Q is "How to find ..." rather than an actual request, so I guess that qualifies as a Newbie board Q.  
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There are two common starting points. (1) SEARCH the "In Search Of" board. (2) SEARCH your local (Boston) board.  Search "couple" "MFM" "MMF" and so on. Depending on what you find, you can then (3) POST your actual request to ISO including the city of interest (so touring couples will know if your city is on their itinerary) and (4) POST your actual request to your local (Boston) board.
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Another way to find (or search) is to go to reviews and search "&" and "and" in the name field, "more than one guy at a time" = YES and a few other data selections. "&" and "and" will turn up things like "Mary & friend" or "Mary and Robert" or "Ben and Chloe" and stuff like that.  There are more successful hits using "and" but also many spurious hits due to "ANDy", "cassANDdra", "mANDy", and so on. Those are easy to filter just by scanning the Profile names.  
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Boston isn't far from NY and there are many couples based in NY or who frequently travel there. Search the NY board for more leads.