Drawing on three case studies from two UK ethnographic research projects in urban and rural working-class communities, this article explores young teen girls’ negotiation of increasingly sex-saturated societies and cultures. Our analysis complicates contemporary debates around the ‘sexualization’ moral panic by troubling developmental and classed accounts of age-appropriate (hetero)sexuality. We explore how girls are regulated by, yet rework and resist expectations to perform as agentic sexual subjects across a range of spaces (e.g. streets, schools, homes, cyberspace). To conceptualize the blurring of generational and sexual binaries present in our data, we develop Deleuzian notions of ‘becomings’, ‘assemblages’ and ‘schizoid subjectivities’. These concepts help us to map the anti-linear transitions and contradictory performances of young femininity as always in-movement; where girls negotiate discourses of sexual knowingness and innocence, often simultaneously, yet always within a wider context of socio-cultural gendered/classed regulations