Lyric discussion by Okunnur 

Cover art for Last lyrics by Nine Inch Nails

I see it as somebody taking advantage of many people, needing for him to be "filled up" he does this by "look through these blackened eyes you'll see ten thousand lies my lips may promise but my heart is a whore" lieing to people, similar to Closer he feels incomplete and needs the sex to keep him alive, (The reference to sweat and blood can mean sex)

and any relationship made, wont last.