Doko

Commissioned by Sésame, a non-profit focused on affective and relational education, Doko is a mobile app designed to guide teenagers through sexual health education by creating a safe, engaging, and professionally supervised space.

The core challenge: rethink how sexual education is delivered to adolescents, moving away from a one-size-fits-all institutional approach toward an experience that meets teenagers where they actually seek information: on their phones, in formats they trust.

Sésame already goes into schools. The brief was to give those classes a life after the bell: something a teenager can open alone, later, with the questions she did not ask out loud.

In collaboration with Carla Deronzier, Maxime Coette, Nicolas Raherison, and Aline Delaunay.

Research started broad, with a strategic framing phase aimed at defining the target user panel, mapping their unmet needs around sexual health information, and identifying viable product opportunities.

We distributed a survey that collected 277 responses, followed by focused sessions with two distinct groups: parents and young adults. Three findings shaped the product direction.

School falls short. 33% of respondents never had a sexual education class. Among those who did, 60% say it did not help them at all, and almost all the others say it helped only moderately.

They look anyway. 63% look for information about sexuality on their own. The demand for reliable, accessible documentation is there; what is missing is a source someone has checked.

The formats are already chosen. Asked what would interest them most, respondents put an Instagram account first (60%), then a website (54%), a dedicated app (46%) and a YouTube channel (39%), far ahead of conferences or exhibitions.

The survey reached adults looking back on their school years. To design for the teenagers of today, we condensed what we heard into a persona: Lila, 14, in her last year of middle school. She lives on TikTok, Snapchat and Instagram, and has questions about her changing body and her first relationships that she does not know whom to ask.

To place the app in her day, we followed her from morning to noon. Lila attends the sexual education class prepared by Sésame at her school. When the class ends, she receives a Doko kit; two minutes later, she scans its QR code.

This settled how the app is discovered. Doko is not something a teenager has to find alone in a store: it is handed over in class, as a physical kit, at the end of a session prepared by Sésame. The class opens the conversation, and the app continues it on her phone.

Based on research outputs, the app was structured around three core product pillars, all reachable from the home screen.

Quiz module: tracks personal progress across knowledge categories, making learning feel iterative and self-directed. Each question is a single statement, true or false, followed at once by a short explanation.

Video space: categorized educational content, browsed as a vertical feed and filtered by theme, such as anatomy or pleasure.

Community FAQ: a moderated space where teenagers can post questions, upvote what matters to them, and receive validated answers from healthcare professionals (sexologists, psychologists). The most upvoted questions are answered in video.

The low-fidelity screens fixed this structure before any visual work. One thing changed on the way to the functioning prototype: the quiz went from four possible answers to a plain true or false, quicker to answer and closer to the received ideas it is there to correct.

The survey pointed to short video, so the video space got the most editorial care. Instead of a single stream of clips, it is organised as four recurring formats, each with its own title card and its own host, the way a channel builds habits.

Hot Line answers the top-voted questions from the FAQ. Porn vs Réalité takes on received ideas, one episode at a time. Focus and Face à Face give the floor to experts and to firsthand testimonials.

Together they cover what a class rarely has time for: the precise question, the myth, the professional’s view, and someone else’s experience.

Every piece of content on Doko is reviewed and approved by Sésame’s educational team before publication, ensuring medical accuracy and age-appropriate framing without compromising the app’s tone.

Beyond the teenagers themselves, we designed a companion landing page targeting parents, addressing adoption friction at the household level by clearly communicating the product’s editorial framework, professional oversight, and safety guarantees.

Trust, in this context, is a product feature: without it, the app never gets installed.