<p>This study introduces the concept of ‘sexual debut projects’ as a novel theoretical framework for examining the interplay of sexual practices, social context, and gendered risk in youth sexual culture. It builds on Hirsch and Khan’s notion of ‘sexual projects’ and is rooted in the sociology of sexuality, which emphasises the social embeddedness of sexual practices. Empirically, we rely on sexual debut stories systematically collected through 127 personal interviews with a gender-balanced, socioculturally diverse sample of 17–19-year-olds in Norway. Across gender and sexual orientation, interviewees defined ‘debuting’ as penetrative sex, reflecting a heteronormative script. Still, the participants’ reasons for seeking or avoiding specific debut experiences varied. We identify five debut projects, presented according to their frequency (‘getting it over with’, ‘reinforcing connection’, ‘controlling one’s desire’, ‘pursuing physical desire’, and ‘exploring otherness’) that together highlight debuting as a social practice that is as much about navigating social belonging, identity, and gendered expectations as it is about sexual desire. Our analysis also shows how sexual debut projects—when mismatched, characterised by urgency and particular implicit audiences—can produce unethical sexual interactions. Our study hence highlights the value of studying ‘harm beyond assault’ to understand risk dynamics in youth sexual culture.</p>