Sin should make you feel gross.  

It should disgust you.

It’s as idiotic as a prisoner being freed from jail but voluntarily locking themselves back up again.

We’ll never be sinless this side of Heaven but we should strive towards holiness and we deserve to feel the sting when we fall short.

“as obedient children, not fashioning yourselves according to the former lusts in your ignorance: but as he which hath called you is holy, so be ye holy in all manner of conversation; because it is written, Be ye holy; for I am holy.”
1 Peter 1:14-16