Trace - my belief and dh's is that stopping conception is ok, so barrier methods alright. Things like coil which stop implantation of a fertilised egg, not so happy. We had a big talk about this and when it eventually comes to telling the girls, we wold generally go with the line that if you're going to have sex, make sure a) you are doing it because you want to, not from any pressure b) you're in a relationship where you care about your partner and they care about you, and c) if you're not in a place in your life where you want to have a baby, make sure that pregnancy can't happen. I don't belive that just straight abstinence education is the right thing (fully respect people who were able to wait until married, if you made that choice and were able to stick to it then that's pretty amazing given the pressures of modern society)
I know the catholic line is that sex should only be done with openness to procreation - but that means that older people, or those with fertility issues, are effectively being told they shouldn't, which seems very wrong. We feel that sex is about strengthening a relationship and is a gift from God (otherwise why would it be so much fun?!) and that if DH has the snip, as is the plan, we'd still be celebrating the amazingness of the human body by getting it on. ahem.
Meanwhile when S says to me halfway through mass "yes but how does the baby get into the mummy's tummy?" I'm very glad to be able to say "this is a quiet bit, I'll tell you later" and then she forgets... :)
I'm such a rubbish wife though, we were sat outisde having dinner and then watching the girls playing, looking adoringly on as E tried to push S on a swing. I lean over towards Dh, he says "if you want to kiss me in front of the girls, i wouldn't object..." and I had to say "sorry, i was looking at the aphids on the rose bush"

Kiwi hope you and dh are having lots of olympic fun!
Beans keeping you and lovely dad in my prayers and thoughts.
Obes how is california?!