Well, sure we live in a world where there are still many prejudices against certain forms of sexual expression, but I'm rather surprised that your father, as an educated man and a psychologist, would think that BDSM is a mental illness.

I, too, assume that my dad doesn't want to know the details of my sex life either, regardless of my sexual leanings or practices and that suits me just fine because I most certainly don't want to know about his! I mean, my dad rolling around ... Oh no ...*shudders* it's just to gross to think about..*gg*

And I think it's unlikely to have an effect on his clients but it's may certainly have an effect on his clientele.

Hey, does your dear o' dad also think that maturbation will make you go blind?