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人们常常用“阳光男孩”来形容活力充沛的男性,事实上,阳光的确是增强男性活力的重要物质,包括精子的活力。最新研究显示,不能使伴侣怀孕的男人普遍存在维
People often use “sunshine boy ” to describe energetic men, in fact, the sun is indeed an important substance to enhance male vitality, including the vitality of sperm. Recent research shows that men who can not make a partner pregnant are ubiquitous