We do try to keep the game as historically accurate as possible while still being fun and balanced, so any improvements or errors pointed out in that regard are most welcome
Regarding the celibate tax, kindly share any links to resources showing these numbers and we'd be happy to fix them up (also it is supposed to stop by the age of 50. And this has been so for some time, maybe you are on a much older version of the game? - please check your settings screen, it should be v1.3.3)
We may add a birth control event/choice going forward and an potential option to ask to adopt your sister's children, etc.
And in one of the next releases we'll be adding in conditions/deals around marriages as had happened historically. (Daughters already inherit your wealth on the same terms as your sons as had happened historically in cases of the person dying without a will)
Please join us on our friendly discord to share and ideas/suggestions or point out errors to help make the game experience the best it can be - https://discord.gg/ZVkxjC5
Thank you for your patronage and for writing in!