Well, first you need to to judge the boobs. Then the tightness and cleanliness of the vag. Does she have a big round booty or just a big booty? No booty?
Can she take it to the chin? Is she able to deep throat you and lick the balls at the same time? Anal? Does she anal bleach? And that's just touching the tip of the iceberg.
It's a pretty extensive check list you have to go through in order to judge one's sexual value. I can see how someone can be overwhelmed while trying to gauge his/her value.
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