The 69 year old admits she prefers playing heterosexual roles as she dreads the idea of smooching another woman for work.
And Margolyes puts her fear down to her worry that her 'straight' co-stars will think she is attracted to them.
She explains, "I don't like playing lesbians. I am a lesbian, but I don't like playing them. I loath kissing women on stage or on screen. Absolutely loathe it. And I'll tell you why, it's because I don't want them to think that I fancy them."