Agreed. Some games are able to escape this issue (Anthophobia and The Agnietta for example) where the protag can only be taken by enemies after all clothing is ripped off. It's basically a shield count before the health meter starts taking hits.
On the other hand, what Syahata has isn't necessarily a bad thing. In a way its mechanic is similar to Night of Revenge's... though I'd personally argue against it because it handcuffs the dev to a specific look. Yes, NoR has alternate outfits but once a sex animation begins the character's look returns to the default. Kind of hurts immersion, if that's what one cares about.
Even so, this game is shaping up nicely! Good to see more monsters and unique designs.