There was a time when love poetry — via the lyrics of Cole Porter, Larry Hart, Ira Gershwin and many other great songwriters — was an implicit part of American culture. Anyone who’s listened to a contemporary rap CD knows that we now live in a very different time. So be thankful for the publication of Bianca Rossini’s “A Brazilian Heart,” a collection of fearlessly honest love poems, filled with the sort of revelatory intimacy coursing through the best entries in the Great American Songbook.