Noa Jansma, from the Netherlands, is a beautiful young woman - and she gets a lot of unwanted attention every time she steps out into the street.

The man in this photo, with his arm draped around her shoulders almost groping her chest, isn't a relative or a friend or a person she actually likes.

He's a random middle-aged person who catcalled her in the street as she walked past, yelling: "Hmmmm. You wanna kiss?"

#dearcatcallers "hmmmm you wanna kiss?"

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The 20-year-old has made a powerful statement about sexual objectification during a month-long experiment on Instagram.

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Every time she gets harassed, she walks up to the offender and asks if she can take a selfie, which is then posted to her @dearcatcallers account.

"It's not a compliment," she declared.

"By making the selfie, both the objectifier and the object are assembled in one composition. Myself, as the object, standing in front of the catcallers represents the reversed power ratio which is caused by this project."

Since she began on August 29, she's posted 24 images of herself with men, listing the words they shouted at her in the caption.

#dearcatcallers "I know what I would do with you, baby"

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#dearcatcallers "weheeee horny girl"

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It's remarkable how many men are happy to smile and pose for her pictures, considering their creepy and downright offensive comments.

She claims a number of them actually followed her for a lengthy period, with one much older man even asking her to get into his car.

Others demanded to know why she wasn't smiling, and repeatedly called her "baby" or made kissing noises as she passed.

slowly following me 2 streets shouting "sexy!" and "wanna come in my car?" #dearcatcallers

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#dearcatcallers ... after following me for straight 10 minutes "sexy girl Where you goin'?? Can I come with you ?" ...

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In the past month, she's accumulated more than 42,500 followers - the vast majority of whom appear to be women who strongly support her project.

She said it's quite clear sexual objectification of women is a "global phenomenon", and though her project is finished, she plans to continue her account.

"Thankyou for all the support and messages," she wrote on her final post.

"It has made it clear that catcalling is still a common occurrence that many of us are dealing with."