chance of pregnancy percentage
If the rate were truly so low as 2.5%, most couples would have to screw for fifty years before the odds were in their favour. Or I'm completely misunderstanding what a 2.5% chance of getting pregnant actually means. posted by five fresh fish at 10:21 PM on February 9, 2005. 2.5% per act of sex. If you're only getting laid once a year, it'd take quite a while, yes.