Vatican II indicates that a teaching can be infallible if defined so explicitly by a Pope or if taught consistently and universally by the Church over the centuries.  The Church's teaching on contraception fits the latter criterion, as John Ford, Germain Grisez, et al., have shown.  Since, I Cor 13:13 notwithstanding, for the Episcopate the greatest virtue is not necessarily love but peace and quiet, they were happy to get Cardinal Ratzinger and the CDF off their backs by getting Curran out of CUA and exported to Southern Methodist.  (Notice, the Bishop of Rochester hasn't had a pressing need to use Fr. Curran's pastoral services in his diocese, as another commentator suggested Weinandy should be sent to do).  I prefer to take I Cor 13:13 seriously, and if love is what matters, then yes, if Curran wants to promote contraception, he should be fraternally corrected (as he has been since 1968) and, if he persists, then truth about real marital love may mean we should use the "h" word.