I'm sure everyone's heard of the 1-10 scale, where 1 is just beastly and 10 doesn't really exist and is considered the hottest of hot. Then 5 is considered average-looking.
I was looking at my husband and of course, admiring his appearance (of course) and I'd give him an 8. He has nice bone structure, has a "rugged" look to him, and I've seen other women hit on him, in front of me. LOL. It also helps that he has facial features that I am attracted to.
Now, that was a personal example. How does someone make that judgement when they just see how another person looks? If you're walking out on the street and you are a guy who walks by a woman, and think "wow, she's an 8" (or whatever you think), how do you make that determination? Is it based on your preferences or certain beauty characteristics? I don't think subjectivity weighs a lot here because to stay that someone's 8 could be another person's 5 is a bit of a stretch. After all, there are markers of beauty for both sexes.
Same for women-- how do you determine what someone's rating is?