Several studies put into light a significant link between sexual orientation and suicidal behaviors among teenagers and/or young adults. The homophobia to which young homo/bisexuals are exposed is considered the most serious hypothesis to explain this link. However quantitative studies have never been conducted on this hypothesis in France. We took it into account while carrying out a survey based on a self-administered questionnaire. Said survey was answered by 475 young women, and 426 young men aged 18-24. Results confirmed oversuicidality among young homo/bisexuals, and highlight the extent of homophobic bullying in school, and its impact on male teenagers and young adults. This leads us to discuss the prevention work carried out by community groups, including assistance to families and school interventions proposed by the association Contact.