translation.en: Well, it is more common with multiple partners, there is less condom use, and there is age-disparate sex -- that is, older men tend to have sex with younger women.
translation.zh: 有多个性伴侣的因素 有不爱用避孕套的因素 有异龄性爱因素 -- 就是老男人喜欢跟年轻女人做爱