For instance anal sex without using any preventive measures and then proceeding to continue with normal sexual intercourse can lead to the entry of bacteria inside the urinary tract through the vaginal canal. For those facing fertility issues, there are lots of options that will aide in successful conception. One of those methods is really a process referred to as intrauterine insemination. Adding a regimen of natural herbs and a few self massage techniques especially designed for fertility issues may increase the likelihood of IUI success. This is the chemical produced in the body which allows the blood vessels to relax and allow sufficient blood to flood into the penis and create an erection. If you don't get enough of it, you won't get an erection, so top it up: