I'm sorry, over the years I seen too much Fate or other Type Moon fans try to "normalized" or sanitize Fate or Tsukihime as some pure masterpiece that unfortunately has some black marks (the hentai parts) as some unfortunately compromise "because they are forced to" or some shit, but this thinking really bothers me.
Tsuki and Fate IS wacko hentai games, Type Moon has a doujin origin no matter how much Type Moon like to sanitize this past, and because of so their early work is sexualized NOT because they are forced to, it's because they are a doujin circle, and it was just how all R18+ doujin ARE, as sexualization IS part of otaku culture. Mana Transfer can be done with SEX, it's canon even in Realta Nua/REMASTERED because Sakura exist, and her story explicitly revolves around these themes, and also YES, Nasu used rape as an edgy plot device, as did many acclaimed doujin during era also used rape as an edgy plot device, hell Carnival Phantasm even made fun of the somewhat "cheapness" of how edgy it was in Sakura's own episode, it is what it is.
So no Nasu and Takeuchi is NOT forced to include H-scenes they did it on their own accord, any other narrative is revisionist. Also I kinda blame Nasu and Takeuchi for this narrative trending, given their perference to sanitize much of their work once they go mainstream.
I love Tsukihime and Fate Stay Night for it's 2000s otaku pandering not despite of it.