If I read the conversations of Pvtes Mulvaney, Ortheris et al. right, Mr Red's observations about "bint" are correct. In these and other texts "bint" always denotes the indigene unmarried young female with no objections to any moral deviations implied in the use of the word.
Speaking with todays veterans of HM's Services, they used and understood the term in the sense described above.

Wilfried