translation.en: Mm-hm.  So with all of this diversity in structure, one might think, then, that penises are fitting neatly into vaginas all over the place for the purposes of successful reproduction.
translation.zh: 嗯嗯  鉴于结构的多样性 有人会想 为了能够成功地繁衍后代 阴茎必须得很齐整地进入阴道