I hear that a fertile couple has a 90% chance of getting pregnant within a year if they aren’t using protection, but what I haven’t been able to gather is how often the average couple has sex.
What are the chances that any given instance of sex will result in pregnancy, assuming it’s done at a random time and we don’t know when the woman if ovulating?
I don’t know the answer to the question, but I do know the U.S. Army considered a month’s supply of condoms to be 9. This was in 1989 when I was on medication that required us to use condoms. My doctor laughed, told me what a month’s supply was, and gave me a prescription for a 3 month supply.
You can’t calcluate those odds without makins some assumptions. If you assume a woman is fertile for “x” days per cycle, then the odds are x/c where “c” = days between cycles. The problem, though, is that you don’t know the guy’s sperm count or any number of other things that could affect a pregnancy happening.
Why will it matter how often they have sex? If I have sex once in my life or if I have sex every day, the chance that one single time is during a period when the woman if likely to get pregnant is the same. It’s still the percentage of time she’s fertile.
I’ve seen 25% mentioned often on fertility sites, presumably that average is going with all the medians and averages possible. I dunno if things like conceptioncentral, fertilitext or babymed are providing viable information, or stacking the deck to make more people likely to seek fertility treatments.
It’s higher if the male has gone without for a while, including without visits to Mrs. Palm (more swimmers in the pool).
It’s also higher if the girl has been saying “no” - Nature is called a Mother because she likes babies; many women get excited more easily when their fertility is higher. We’re not that far from the other animals… (No cite, but I know several cases of cherry pregnancies)
For sure. My parents married on 17th March 1951. Eldest sister arrived on 31st December. Unquestionably a legitimate conception but they didn’t hang around.
I think the OP understands all the “It depends” and “the rate varies because” scenarios. You don’t have to do an analysis with every possible permutation. Just throw all the fertile people into a big pile (no pun intended) and say that the rate of pregnancy is X for Y instances of intercourse for all fertile people.