[2.3.4 FMNO] Nothing prevents female characters to impregnate each other

[M. Pif Paf]

It's trivial but it looks like a bug to me. No events involved.

I'm sorry if it's already known.

No mods.
All the major DLC's except Charlemagne.

Spoiler: Some screenshots

 

[Leo Larsson]

Hi M. Pif Paf!

This issue has been reported into our database and its known to our developers.
Thank you for taking your time and reporting this issue!