The photo is real: unstaged and not 'doctored'. But all the surrounding text from the originating claim is misleading.
The photo depicts the artist Mare Tralla. And some visitors to an art exhibition called Naine&Naine at the Pärnu Summer festival.
It is important to note that she was scheduled to open the exhibition. An exhibition that also showed works by artist Marko Mäetamm whose works are seen in the pictures.
These are his works on the wall and Tralla believes these to be sexist. That's why she undressed unexpectedly and began to hang sheets over Mäetamm's paintings with slogan's meant to criticise and expose these sexism depicted on them. As Tralla was only expected to deliver a speech, and not that much more, it was indeed 'a scandal' in Estonia as well. (Scandal in the Art Hall: Mare Tralla considers the work of a male colleague sexist)
Opening the exhibition "Woman and Woman" in Pärnu on Saturday, Mare Tralla caused a scandal with her naked performance: the artist covered the work of Marko Mäetamm, who performed at the exhibition with anti-sex slogans.
However, this is not the only exhibition that explores the boundaries of Pärnu. It could even be said that the summer capital will become the act capital of Estonia. After the 26th nude exhibition "Man, Woman, Freedom" opened in Pärnu City Gallery last Saturday, a man and a man depicting the human body was unveiled, and a bold "Woman and Woman" was set up in the artist house of the city. Tralla's "performance of protest" is now part of the exhibition.
Exhibition “Man, Woman, Freedom” at the Museum of New Art in Pärnu offers a good selection of works by different authors. There are paintings, photos, sculptures, silk paintings, woodcuts and video art outside. In addition, the works of two authors, Kaupo Kikkas' biblically-influenced landscape of human figures and rare photographs of Ernest Hemingway by US painter Waldo Peirce, have been set up in separate halls.
–– INDREK TARK, Eesti Päevaleht, 1 Juuli 2019
The so accused artist says to this:
"I have white skin, I'm a hetero, a team artist too. But in my opinion, my work speaks to women's supremacy," published artist Marko Mäetamm, whose works were criticized by a female artist participating in the grand exhibition Pärnu Art Summer.
–– Anu Jürisson: "Marko Mäetamm: I stand for my work until I die" –
The work of the male artist came under criticism from the female artist, Pärnu Postimees, June 30, 2019.
That means that the headline from CitizenFreePress ("Insane Photo — What the hell are they teaching our kids!") is a incorrect. These are not "our kids" but Estonian visitors to an art exhibition. And this is not about "teaching" anything, but an unexpected presence of protest.
The claim-accompanying Twitter post is even worse:
School kids recently went on a trip to a feminist "art exhibit" and this is what they saw. This is child abuse. This is insanity. This is the lunacy of left wing social engineering in action.
The kids and adults in the picture went to an art exhibition where a male artist displayed his sexual works said to be sexist and abusive of women. A woman protested against this by disrobing. It is difficult to see how this can be accurate described as "the lunacy of left wing social engineering in action".
A better write-up can – at least partially – be found in other English-speaking media, in this case right-wing extremists:
As one circular reports on this picture:
The video in the above link is indeed useful to grasp the atmosphere of the 'performance'.
Regarding 'teaching' and school, it is also relevant that the event took place at the opening of the exhibition. That was a Saturday. 29 June 2019 is also interesting as 12. June 2019 to 31. August 2019 are school summer holidays in Estonia. It may be a bit hasty to infer from that that 'teaching', 'school' and 'this picture' do not have that many connections to a 'school forcing kids', but I'll just go ahead and do that: No school forced any of their teenager students to participate on a Saturday evening during the holidays to go there.
Most people in the picture are adults. For example, the female cap-wearer in front of six female breasts and three vaginas isn't a teenager but art historian Marian Kivila. While she is the curator of this exhibition, she seems to react in her personal way to individual exhibits.
The Pärnu Summer Art festival site describes the intent of the 'exhibition' as:
On June 29, two exhibitions - “Man and Man” and “Woman and Woman” will be opened in Pärnu City Gallery's two exhibition halls. Although the names of the exhibitions may refer to another traditional Pärnu big man and woman's summer exhibition in Pärnu, the exhibitions are not an extension, criticism or parody of the UKM project. Rather, the exhibitions could be seen as an attempt to engage in dialogue with the Pärnu traditions, as well as to dissolve the tradition as a very multi-layered cultural phenomenon and its nature in the sense of body and gender art.
"Man and Man" and "Woman and Woman" bring to the audience the works of Estonian (and one of Russia) artists who, directly or indirectly, dissect the subject of gender roles. And not in the narrow context of erotic art, but in an attempt to open up body and gender reflections in the narrower sense – through everyday humor (Marko Mäetamm), through socio-political-historical prism (Leonhard Lapin, Sandra Jõgeva, Mare Tralla), through contemporary mythology (Andrus Joonas), through the autobiographical spectrum (Rene Kari, Evelin Zolotko), through feminist approaches and the irony of stereotypical gender roles (Lilia Li-Mi-Yan), but also in many other ways.
Participating artists: Mare Tralla, Sandra Jõgeva, Evelin Zolotko (HUUPI), Lilia Li-Mi-Yan, Kiwa, Marko Mäetamm, Rene Kari, Jaanus Samma, Leonhard Lapin, Peeter Allik, Andrus Joonas, Alar Raudoja, Alan Prosa, Anonymous Boh.
Curators of the exhibition are Marian Kivila and Jan Leo Grau (Avangard Gallery, NGO)
For anyone non-Estonian reading along and wondering about cultural differences in attitude towards really "teaching about sexuality": in Estonia's schools sexuality-related education starts in grade 5 and the UNESCO judges Estonia's approach to STDs, pregnancies, etc. as very effective.
Kai Haldre & Kai Part & Evert Ketting: "Youth sexual health improvement in Estonia, 1990–2009: The role of sexuality education and youth-friendly services", The European Journal of Contraception and Reproductive Health Care, October 2012; 17: 351–362
Translations from Estonian via Google Translate. Please improve!