MC Occult overrides the EA settings on valid genders for pollination - it enables ladies to be pollinated by default and also prevents anyone who has a fertility setting that doesn't match their sex from being pollinated at all - including sims you might've neutered (this can't be disabled, you'd need to either remove the sim's custom gender trait or remove MC Occult). I've also had someone say that they've had MC Woohoo prevent guys from being able to be pollinated, but I believe this was changed in a later update and now works again (I don't use that module so can't confirm either way.)
If you'd like to increase the chances of alien abduction and pollination, you can use this mod's Mysterious Skies lot challenge on your residential lot - it does keep the chances of pollination at 25% per abduction, but it massively increases the odds of getting abducted to about 50% per sim, per night, including visitors on your lot. I don't think MCCC overrides Mysterious Skies, but haven't done a lot of testing there.