antisperm antibodies

My husband had a semen analysis done. The results came back with 9 percent antibodies and are doctor recommends <a href="https://glowing.com/glow-fertility-program">IUI</a>. Does anyone know.about antibody percentages and what is considered infertile? Or more info on <a href="https://glowing.com/glow-fertility-program">IUI</a> would be appreciated.