Someone on Twitter said "Those who have low tone voice and sunburned skin are likely to get girlfriend(s) easily". And, today, I knew a friend of mine got one. As the theory says, he has low tone voice and sunburned skin.
In addition to it, a recruiting staff in a company said to me"I recommend job-hunters to have sunburned skin to make interviewers of Japan's companies belive they have aggressive character."
But, this is based on the discriminative assumption that black people are aggressive and White are not. So, I won't agree with the idea.