According to Konstantin Jireček, in his book “State and Society in medieval Serbia, Volume 3, p. 31,” Saint Sava of Serbia with tears in his eyes begged his people to refrain from homosexuality, beastiality and adultery.

Cited from Noel Malcolms book “Forbidden Desire in Early Modern Europe Male-Male Sexual Relations, 1400-1750”:

“The time has come to address the larger issues raised by this account of same-sex relations in early modern Europe. Just before doing so, however, we should consider some of the limitations of the material studied here. The geographical coverage has been necessarily uneven; while the Mediterranean region and north-western Europe have been discussed in some detail, almost nothing has been said about sodomy in the Orthodox Slav world during this period, for the simple reason that very little research has been carried out on that subject.

The best available treatment is a short section of a more general book by Eva Levin; it relies heavily on the texts of the Orthodox penitentials which, stemming from the Byzantine tradition, exhibit broad similarities from the Balkans to Russia. There are always uncertainties involved in extrapolating from the prohibitions of moral theology to actual practice; nevertheless, this sort of evidence does give some sense of the social and sexual world which the priests and their flocks inhabited.

(As the great Slavic scholar Konstantin Jireček wrote, commenting on a report that St Sava, head of the Serbian Orthodox Church in the early thirteenth century, begged his flock with tears in his eyes not to engage in adultery, bestiality or sodomy: ‘he would not have done that without a reason’.)”

Source

Forbidden Desire in Early Modern Europe Male-Male Sexual Relations, 1400-1750. Noel Malcolm. 2023