性学专家认为,胡须是男人的第二性征之一,胡须稀疏并不是一个很大的缺陷,关键还是要看其他男性特征,比如睾丸大小、喉结、声调等六个方面有无全面的异常表现。“嘴上无毛”引出烦恼刘先生虽然嘴上只有稀稀拉拉的胡 Sexologists believe that beard is one of the second sexual characteristics of men, beard thinning is not a big flaw, the key is to look at other male characteristics, such as testicular size, Adam’s apple, tone and other six aspects of whether there is a comprehensive anomaly . “Mouth glabrous ” leads to trouble Mr. Liu although only sparse mouth Hu