If you meant specifically erotic transference towards clients, I too would tend to think that male therapists unconsciously act it out more than female therapists. I think, it's just not in the female nature to feel sexually attracted to a man who came to her for help with his emotional issues and his life problems, while for males the opposite is often true. But the cases of female therapists attraction toward male clients do exist, even though they are not as common as with male therapists.