The Gossip Girl star said she believes stripping in movies is "distracting" to the plot.
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"When I see nudity in movies, I am always distracted by it. I know that if I am watching a scene and someone has their boobs out, then that's all I'm looking at - I can't help it," Lively told Style magazine.
"I just don't think that will ever be right for me."
Speaking of her fitness regime, she added: "I am terrible, I don't do any exercise - I'm going to have to learn the hard way. I love food too much, and my family is from the South, so the food I like is not necessarily the best for you.
"There are days when I will be like, 'Oh my goodness, I am not happy with the way I look because I cannot fit into any of my clothes'. So I eat quinoa that week, and then I feel good."
Lively, who is currently dating fellow actor Ryan Reynolds, stars in new film Savages, which opens on September 28 in the UK. Watch the trailer below:
