When Wives try wives

one of the things i learned, late in life, about my wife, is she was attracted to women. there was a neighbor, friend, that thought was hot.
unfortunately, she was too shy to make a move.
 
question;

how do most bi relationships start, with the wives? i know several start in college dorms & teen-age sleepovers. how about the rest? bi women are hot & i'd love to know more.

thank you, ladies.