“We rely heavily on users to flag inappropriate content and we do our best to remove any media that we determine to be inappropriate,” an Instagram spokesperson said in an e-mail.The app, which has always allowed users to report abusive photos, recently introduced a feature allowing people to flag inappropriate comments, as well.

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The photo-sharing app puts photos front and center, allows for a degree of anonymity, and encourages public posts that help like-minded strangers find each other.

The product's real-time stream of images and the ease with which it can be accessed on smartphones also ensures that users can connect at all hours of the day.

But beyond the food porn that regularly tops Instagram’s “most popular” list lurks an abundance of, well, porn porn.

Images tagged with terms such as “sextagram,” “instaporn,” and “handbra” summon up tens of thousands of images of genitalia and nude -- or nearly naked -- men and women posing provocatively in beds, in bathrooms, or with a partner in a similar state of undress.

While the Kik user associated with the account Rate Sexy Insta Pics declined to speak about his (or her) experience with Instagram, he (or she) followed up to ask this reporter if she wanted a “shout.” What’s that?

Riccardo G.’s profile on Couch Surfing.com, the website that partners intrepid wanderers with willing hosts, notes that he lives in the “best neighborhood to go out and have drinks,” that he offers a “cozy/clean/nice sofa/couch” and that he’ll even let you bring your “small dog, if you just can’t live without him.” He describes himself as “amazing, outgoing, funny, smart” and says his interests include friends, eating, drinking, the gym and puppies.More users invariably means more sex, and the top three most popular social media sites in the U. -- Facebook, Twitter and Pinterest – as well as Tumblr, the tenth most popular, have all struggled to crack down on users whose X-rated postings violate their terms of service.In the past year, Instagram has grown from 10 million users to 80 million.The more graphic photos show people masturbating in front of the camera, while others might not look out of place in a Victoria’s Secret catalog.There are 135,000 photos tagged “latte” and 201,000 tagged “Instasex.” The hashtag “wet” has nearly twice as many images.“If something bills itself as non-pornographic then becomes that way, to me it’s a sign that it’s reached the public knowledge-base, and now it’s solidly there.” “On Instagram, the community appears to be changing,” Senft added.