Dave,
Here is a suggestion for you: There is a really good book called "Taking Charge of Your Fertility" by Toni Weschler. (I think I spelled her name right)
It was designed to be used to either get or prevent a pregnancy. Basically it teaches, with the use of pictures and drawings, how a woman's fertility cycle works. Women, as a rule, are hopelessly out of touch with the mechanics of their own bodies.

When I was reading it (to achieve pregnancy, which didn't end up happening w/o the use of drugs) I was amazed at how little I knew and much I had misinterpreted the normal signals of my body, over the years.

Being responsible for your own fertility is a big decision. It requires a level of dedication that makes most people shudder.

HOWEVER, it's gotta beat the "pull out" method that you are currently using!

That way you could relax and enjoy the moment. Just a thought for you..

Honey, who is infertile and therefore has no worries, mate.