Because he looks like this.
Also, because he tells his wife, who has a “hostile uterus” and who could possibly inherit her mother’s Alzheimer’s gene, this:
Here’s what we’re gonna do. No more doctors, no more labs. You and I, we have a lot of sex. Maybe we make a baby, maybe we do not. Maybe you get Alzheimer’s, maybe you do not. Just screw the odds, screw science. Let’s just live. Whatever happens, happens. Me and you. Okay?
Oh McDreamy, I’d marry you over post-its too!
Sometimes words speak louder than actions and the writers at Grey’s Anatomy have got that knack for the right words down pat.