These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Fetish Fuel: Between the sexual imagery of the gaping wound and the fact that Nakoshi and Yukari are doing it in the middle of sex anyway, it really can't be helped if you start getting turned on by blood-sucking.
Freud Was Right: When you see things like an image of a woman with a locked safe for a crotch, what else are you supposed to think?