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A
Canon XXX.
Canons of Local Councils Received Ecumenically (Ancyra, Gangra, Neocaesarea, Antioch, Laodicea) · The Seven Holy Ecumenical Councils
None of the priesthood, nor clerics [of lower rank] nor ascetics, nor any Christian or layman, shall wash in a bath with women; for this is the greatest reproach among the heathen.
LocalE 5.37.2
Zonaras explains that the bathers were entirely nude and hence arose the objection which was also felt by the heathen.
LocalE 5.37.7