OR their life instinct started off as sexual conquests and now is strong in looking at the whole body. They are trying to reach self-actualization. Now they are 30 and those needs are met and they are fulfilling their needs for beauty, harmony with the earth, and closer to self-actualization. Being exposed with their friends strengthens their attitudes and affects their behavior. Behavior is a function of the rewards and punishments in the given environment.
Some people love to eat red hot chili peppers.
They actually burn in your mouth and release endorphins to kill the pain. People are motivated by survival for themselves and their offspring. The goal is to have children with a healthy mate. OR eating red hot chili peppers can kill or weaken the immune system. These people will not likely find a mate and will die off over the generations.