I see nothing wrong with seeking out dates that you find physically attractive, but I think that if “physical attractiveness” is high up on your “wish list,” you run the risk of bypassing some real gems.
I agree with others that physical attractiveness is fleeting, and can be destroyed in an instant (accident, illness, etc.) or over time (aging process, illness, etc.).
If you want to know what a young person will look like when they get older, look at their parents.
Also, if you find fatness or obesity repulsive, be careful about getting involved with someone who “loves food” and is able to eat a LOT of food (and drink) and stay thin.
Even if that person is thin, if they are young, the thinness is probably the result of a combination of youth and activity level. As people get older, the ability to eat all you want and stay thin often goes away (it did with me and many others that I know!). Also, as a person gets older, job and family responsibilities make it harder and harder to maintain an “active” lifestyle, and so the pounds tend to creep on.
Also, even if a person is a marathon runner (or involved with some other physical activity) when they are young and is determined to continue this activity, sometimes the body betrays us. I used to do all kinds of activities, but when I developed osteoarthritis in my left knee, it became impossible to do these activities. Even riding a stationary bike hurts me now.
These types of physical chronic conditions happen even to people who try to stay in shape and at a good weight, and the result is often a decrease in physical activity, which leads to weight gain.
I hope you’re getting the idea that physical attractiveness is fleeting!