What does it mean to be “mostly heterosexual”?

From Psychology Today, September 18, 2013

A recent review article by Cornell University Professor Ritch Savin-Williams and his graduate student Zhana Vragalova described four main research findings about those who describe themselves as mostly heterosexual: 1) they have a distinct pattern of attractions and are more likely than exclusively heterosexuals to have some same-sex behavior; 2) They are well represented in the population; 3) Their “mostly heterosexual” orientation was relatively stable over time; and 4) This label was subjectively meaningful to those who adopted it. Read more