Everyone sins, sure.
We all rationalize why we do things we know we shouldn't.
All sin is not equal.
Obviously, killing someone is more serious than stealing a pack of gum.
It's easy to make restitution for theft. You give it back or pay for it.
You can't bring somebody back from the dead.
Anyways, in the LDS temple, I made a vow to God specifically to keep the law of chastity, which means no sex outside of marriage. I promised to do it, so I'm keeping that promise.