Sexual orientation in Roman society was neither a questioned nor a judged matter.
How a person expressed their sexuality was based and limited to class, age, and marital status rather than gender.
Others were compiled by the antiquarians who first picked over the wreckage of the monastic libraries after they were dissolved or dispersed.
Identifying particular manuscripts with ones that have been described may be aided if they contain inscriptions which give the names of owners at particular times.
Indeed, he considered it second only to bestiality as an abuse of sexuality. For Roman citizens, marriage was a duty and was not meant for the purpose of fulfilling erotic needs.
Therefore, it was considered normal for a male to look for sexual fulfillment outside marriage, though females did not have such liberty.
This is a huge area of study, but there are some things that jump out at even the observant amateur, although the question of why certain fashions come and go is more complicated.