Hi, normal semen analysis value for motility should be 50% or more with progressive forward motility. Reduced sperm motility is called asthenospermia, that is your problem. IUI is a better option for the treatment of infertility due to asthenospermia. The success rate with IUI is 20 to 40% depending on different institutes. The success rate can be increased when along with IUI, superovulation is performed. Means inducing the ovulation with hMG or hCG. It may take 4 to 6 cycles to get success. But don t worry sometimes with first attempt only success can be achieved. Your doctor will explain you the remaining things. All the best. take care.