The books I've been reading also state that, you shouldn't worry that lots of the sperm seems to end up down the loo (sorry for TMI), there's more than enough left to help your chances of conceiving.
Nicki's right though, when it's our time it's our time but we're at the desperate stage of doing anything to help us along.
My AF must be due any time this week, I really hope she doesn't show up this time....