For some historical context: Savin's aversion to pregnancy content goes back to CoC1, wherein essentially every character got pregnancy content. This included Helia, and adding pregnancy content to her kind of ruined her existing character by forcing a wild girl, which was her appeal, to take responsibility and settle down. You also couldn't avoid it, since the pregnancy event was triggered by maxing out her friendship with you.
Part of Savin's response to this was why Syri insists on wearing condoms during vaginal sex for most of her content. I personally find condoms to be a huge turn-off, and in order to fix this I had to invent Sterilex and then write an expansion for Syri that would provide a justification for why she hadn't been taking it before but would take it now.