Background: This study addresses the sexuality of people with moderate intellectual disabilities (PMID), a topic that has been little studied. Understanding romantic and sexual experiences is highly relevant for reducing stigma and prejudice related to their sexuality. Additionally, comprehending the level of sexual knowledge of PMID contributes to the development of preventive and sexual health education programmes tailored for this group. Our aim is to explore the sexual history (relationships, sexual behaviour, condom use and sexual abuse), sex education received and the level of sexual knowledge of PMID. Method: The total of 142 PMID completed questionnaires about sexual knowledge and experiences, and their support staff provided additional information. Data were analysed using chi‐square test (χ2) and descriptive statistical analysis. Results: Masturbation was the most common sexual behaviour (75.7%), especially among men (χ2 = 5.81, P < 0.05). Sexual intercourse was rare, and only 30.5% reported using condoms. Women reported a higher prevalence of self‐reported sexual abuse (27.3% vs. 6% in men). The study also highlighted misconceptions about sexual intercourse risks and contraceptive methods. Conclusion: The results suggest that PMID need sexual education to ensure healthy sexual experiences and prevent risky behaviour. [ABSTRACT FROM AUTHOR]