I am just bringing up the main weakness of natural condoms in case any reader of this string is unaware of them.
Furthermore, the fact that someone is in a presumably monogamous marriage does not rule out the possibility that one partner or the other is not harboring an STD. Remember, not every STD has a cure. Thus, one partner or the other may have something like Herpes from a PRIOR relationship and may not wish to pass it on to their life partner. In that case, natural condoms are a very bad idea indeed, whether or not the main concern is avoiding pregnancy.
So, no-I’m not implying anything of the sort. Troublestarter!
The idea of sheepskin condoms is actually just kind of gross, but I’ll check out the Durex kind. We’re doing the Natural Family Planning method now, which is very effective if you are highly motivated (and self-controlled, which is more difficult). And I am not too worried about STDs. We are married and since we saved sex for marriage (both came in as virgins) we don’t have to worry about any of that stuff. One of the very nice things about saving yourself for your spouse 
Sex outside of marriage seems a very dangerous proposition to me. Condoms fail at preventing pregnancy occassionally, even when used correctly, and HIV is soooo much smaller. As an ER nurse I’ve seen too many lives wasted by AIDS. Very sad and unnecessary, IMO.
Oh, and there is an okay pill for breastfeeding moms, I just couldn’t stand the thing. It’s called the minipill, and it contains progesterone only, no estrogen. Unfortunately I had a period every other week on the darn thing and that is NOT cool. So we are staying far away from the cursed minipill.
Just a final word of caution-and PLEASE don’t think I’m implying anything- remember that not all STDs are transmitted exclusively by sexual activity. Hepatitis, for example, could be contracted via a transfusion of blood, and then passed on sexually. (I’m sure, as a nurse, you’re aware of that and the other possibilities of that nature, but there are others on the string.) So, assuming you had your blood tests when you got married, and no one has had a transfusion, etc., then those sheepskin condoms should be OK.