It is inter-uterine insemination. I had it done on 2 occasions. It was kind of weird. DH left his "product" the day before and they did a wash. The next morning I went in and they confirmed that it was his, then put it in a plastic syringe and inserted it. The natural way is much more fun, but this is what helped us conceive our youngest. I was on metformin and actos at the time.