QRM is right! It's tough going, my brother took 5 years and i myself when i first married.
In some way i do believe if the woman is desperate for a child it has a negative effect, my girlfriend was always on about having a child and i believed at the time it was just a desperate bid, to secure out bonding, which too me at the time was kind of scary as i wasn't ready...
I sincerely believe the women's mental state plays a big role, the emotional stress of wanting a child effects the chemicals of the body and more effort is needed.
I remarried at 50 and my second wife was mid 30's, not much time left for having children, however i made sure by having sex several times a day before and after ovulation and it worked, though you must remember that the woman should not stand up after sexual intercourse.
You need to help the little sperm on there way upstream, so she needs to raise her hips high for the sperm to run in the right direction after every sexual contact....common sense will tell you that if she stands up after a minute or two after intercourse, the sperm will run in the opposite direction and make it more difficult for the sperm to run upstream, it worked for us in the first month, though after 30 or 40 attempts you will be psychically drained

but what a way to get tired!
Give it a go, no harm done at all, just ensure that the bottom half of her body is elevated so the sperm runs deep and stays there to get attached to the membrane, so they can wiggle forward.
My advice also helped others in getting pregnant too so i am pretty confident about the theory, when women are so desperate many stress hormones are at work which may kill the sperm she needs to relax, let her listen to some meditation music while relaxing after the event in the elevated position, hips raised and legs raised at least 45 degrees for 30 minutes and enjoy

There must be something wrong in Singapore for the fertility rate to be so low could be the water
Timing the ovulation is very important, and in that period a few days before and after you really need to be like rabbits and that's pretty active, as many times a day as possible until you start to get a pain in your goolies!
