1. Sexual development as a Complex Dynamic System Theoretical framework of a (healthy*) (pre) sexual development of youth and adolescents *We define healthy sexual development as development leading to a state characterized by a full range of sexual and sex-related behaviors in a consensual, pleasurable and empowering relationship with others

2. The SDDS-model (Sexual Development Dynamic System- Model)

3. Short-term Long-term

4. Subjects CH1 = Cohort 1 (Bovenbouw Basisschool Groep 6/7/8) CH2 = Cohort 2 (Brugklas/ 2de klas voortgezet Onderwijs) CH3 = Cohort 3 (3de/ 4de klas Voortgezet Onderwijs) CH4 = Cohort 4 (5de/ 6de klas Voortgezet Onderwijs plus eerste en tweede klas MBO en eerste klas HBO) Schools are recruited in the northern provinces Groningen, Friesland and Drenthe

5. Design +/- 350 Subjects Diary-studie Cross sectional study (525 per cohort) Questionnaire= 1 Adjusted questionnaire= 3 and 5 Questionnaire= 1 (+ Hyves profile) Adjusted questionnaire= 3 /5 Personal diaries= 2/4/6

6. The SDDS-model: Short-Term (Agent Based model)

7. Subject Peers Transactional Interactions Iterativeness Concern Actual Concern Complementary Mutually competitive Characteristics Subject (1) Biological (2) Social (3) Cultural Emerge in interaction -Emotions -Behaviours Individual Sub-components (1) Representations (2) Value (1) Biological and brain maturation/gender etc. (2+3) Education/ upbringing/values, information retrieval etc Tools Like behavior, social power, skills, influences etc. Characteristics interacted In relation with opportunities (Self-organizing) Emergence Concern Processes of influences Social Contagion Role Modelling Social Evaluation Etc. Evaluations (1) Trough emotional appraisals, marked by emotional expressions

8. Subject Peers Transactional Interactions Iterativeness Concern Actual Concern Complementary Mutually competitive Characteristics Subject (1) Biological (2) Social (3) Cultural Emerge in interaction -Emotions -Behaviours Individual Sub-components (1) Representations (2) Value Tools Characteristics interacted Social contagion Processes of influences Social Contagion Role Modelling Social Evaluation Etc. (Self-organizing) Emergence Concern Evaluations Diary study (digital)

9. Subject Peers Transactional Interactions Iterativeness Concern Actual Concern Complementary Mutually competitive Characteristics Subject (1) Biological (2) Social (3) Cultural Emerge in interaction -Emotions -Behaviours Individual Sub-components (1) Representations (2) Value Tools Characteristics interacted Social contagion Processes of influences Social Contagion Role Modelling Social Evaluation Etc. (Self-organizing) Emergence Concern Evaluations Cross-sectional Questionnaire (digital)

10. CSS-Questionnaire

11. (PCG: Personal CharacteristicGeneral ) PCB: Peronal CharacteristicBiological PCS: Personal CharacteristicSocial PCC: Personal CharacteristicCultural Excel

14. + TRAJECTORIESTRAJECTORIES Time Long- term State-space grid model MECHANISMMECHANISM Desire Reinforcement Information retrieval + + From short-term to long-term development

15. The SDDS-model: Long-Term (State-space-grid)

16. Hypothesis + (3x3) x 6…etc.

17. = healthy and satisfactory trajectory of sexual development Hypothesis 1:

18. = having risky, problematic or unsatisfactory sexual development Hypothesis 2: