The IUD should not hurt your partner. You may have heard that the IUS strings can bother men while having sex, but most partners cannot even feel the strings. If your partner can feel the strings, and that bothers him, your healthcare provider might be able to trim them. Plus, they usually soften over time [1].
References
- Faculty of Sexual & Reproductive Healthcare. (Amended 2019).
Faculty of Sexual & Reproductive Healthcare Clinical Guidance:
Intrauterine Contraception Clinical Effectiveness Unit. RCOG. Retrieved
from https://www.fsrh.org/standards-and-guidance/documents/ceuguidanceintrauterinecontraception/