You don’t need a control group.
You need to know the rate of pregancy among rape victims to judge whether a law criminalizing abortion warrants a rape exception.
BTW The average couple trying to get pregnant has intercourse about 110 times before getting pregnant.
The number varies by ethnicity to a discernible degree. The Sa’ami have a reputation for extraordinary potency ~ one time. Of course they live where it is very cold much of the year, so that makes sense.
Damn....I remember those days.