Maybe a couple that bones 4 times per month (a lot of couples are this way), some percent of the time with success... Well if the average sex has a 10% chance o

Maybe a couple that bones 4 times per month (a lot of couples are this way), some percent of the time with success... Well if the average sex has a 10% chance of inducing pregnancy (this is perhaps the case for certain pairs more than others), then it will take, on average, 2.5 months to get pregnant. Perhaps the 2/3 drop plays out linearly (since it's simply remarkably rare that a sperm gets thru to the egg... Suddenly it might take an average of 7.5 months. If this is the case you suddenly have far more couples giving up, separating etc. Perhaps it's a bigger deal than we imagine. I agree tho: you'd think it'd almost be a plus... less need for birth control! win!