[lizard]

Physical attributes are easy to recognize, so if these weigh heavily in your expectations, you can more rapidly estimate the distribution. Being able to do this quickly also means you can break out populations to make more accurate estimates of your current environment; i.e. while the media bombards us with beautiful celebrities, you can maintain an independent estimation of your actual dating pool.

Social attributes take more time. You need to spend time with someone to understand where they are, and you would need to spend time with a lot of people to understand the distribution. You can try to use heuristics, like being in a relationship with someone you believe has similar expectations, but as noted those aren't actually very accurate.