Jake Gyllenhaal says watching his sister being stripped and spanked was disturbing.
The 26-year-old actor struggled to sit through his elder sibling Maggie's erotically-charged scenes in her film "Secretary", in which she played a woman seduced by her sadomasochistic boss.
When asked if it was weird to watch the sexually explicit film, he said, "Well, it wasn't necessarily erotic for me."
The "Brokeback Mountain" star also revealed his sister had to go to extreme lengths to be considered sexy when she first started acting.
He added, "It's funny, when she was first going for auditions everyone was telling her she wasn't sexy, not sexual. I remember her buying a skimpy cut-off dress for one audition and it just wasn't her. Now she is treated as a sex object. Strange."
Jake also let slip that Maggie is going grey.
The actor - who had to grow facial hair for his next project 'Brothers' - said, "Since I grew a beard I have noticed a grey spot. My sister had a grey spot on her head, maybe it's something genetic."
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