Yep, that's right.
In what is being called a first of its kind study, researchers...have discovered that about half of all people have a gene that makes them more vulnerable to promiscuity and cheating.While it isn't a forgone conclusion that people with this gene will cheat on their mates, the presence of that gene makes such a temptation harder to overcome. Imagine that, some people (half of us) have a harder time overcoming such a temptation and yet God supposedly judges us all equally. That doesn't seem fair now does it? I wonder if the incarnate Jesus gave himself that gene since he was "tempted in every way, just as we are.” (Hebrews 4:15) ;-)