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(1 edit)

Things sound about right. An important element to understand, is that even though you set the chance to 30%, it's not truly 30%, as each of the participants has to roll that chance. 30% is still pretty high, but can you roll it twice (one for the impregnator, one for the impergnated) with success? I get that this might not sound ideal, but this is made because using anything above 10% would often feel for majority of the users like using 99%.

With this logic, the probability of 30% is actually 9% (30% * 30%). The one that succeeds in your case, 40%, is actually 16%.

Thank you! I had no idea! I'll change the chance to a higher percent.

Hi. Maybe that's not the right place to ask, but if this is how the pregnancy chances are calculated, how does the intersex mod work then? If I have the probability at 50%, the chance that one parent gets pregnant will be 25%. Is the chance that both parents get pregnant at 6.25% then? And is the chance to get one child 25% * 75% * 2 = 37.5%?

That's right, it would be 6.25% of getting both pregnant at a 50% probability. The number of children that get born is not affected, but if you're asking about just one Sim getting pregnant then that's 25%.

(2 edits)

So it first determines if Sim 1 impregnates Sim 2 (25%), then if Sim 2 impregnates Sim 1 (25%). So the chances are like having two WooHoos in a row...

Maybe decreasing the chance for a "Both" Sim to get pregnant when having sex with another "Both" Sim could push the probability of a child regardless of impregnator and impregnated down to 25%...

It's math time. I'll have to think, but I think that currently a "Both" couple has a higher chance of one getting pregnant than any other couple. I'll see if I can come up with a solution. Unfortunately I can only comment here because the other comment section is locked.


Edit: I got the solution. Whenever two "Both" Sims have sex, the fertility chance (the one you can set) has to be calculated according to this formula

sqrt( - sqrt( 1 - 2 * f^2 ) + 1 ) / sqrt( 2 )

with f being the set fertility chance (let's say 50%). Then it can be passed to the calculation of pregnancy.

The result is 38.27%, so the chance of Sim 1 impregnating Sim 2 is 38.27% * 38.27% = 14.64%. That's also the chance of Sim 2 impregnating Sim 1. As such, the chance of the WooHoo resulting in a pregnancy can be determined using binomial distribution f ( 1, 2, 0.1464) = 25%. That makes a pregnancy as likely as if it was a non-both WooHoo.


Edit 2: That method only works for simple pregnancy mode. I still have to come up with a general solution.