This study aimed to analyze the jargons and terminologies used in sex education materials, specifically Grade 7 textbooks at Tayabas Western Academy. Using a corpus linguistic approach, the researchers examined the frequency, categorization, and contextual use of terms related to sex education in materials published between 2019 and 2024. The corpus was processed using AntConc and word cloud generators to identify recurring linguistic patterns and key concepts. Findings revealed that the most frequent terms were Reproduction, Sexual Reproduction, Pagbibinata, Pagdadalaga, Fertilization, and Sekswal, emphasizing biological and developmental concepts. Filipino terms reflected the integration of moral and cultural values, particularly in Edukasyon sa Pagpapakatao (ESP) materials. The semantic web analysis grouped the terms into five domains: Core Biological Processes, Human Development and Puberty, Reproductive Anatomy, Sexuality and Relationships, and Sexual Health and Rights. Validator feedback indicated that while students were exposed to sexual terminologies, their understanding remained inconsistent. Teachers emphasized the need for motivation, bilingual explanations, and value integration to improve comprehension. The study concluded that effective sex education requires balancing scientific content with moral and cultural instruction, guided by teachers and supported by parents.