If you're a non-scientist, you might have once asked yourself, propped against the bedhead after disappointingly quick intercourse, how long does sex ...
The average (median, technically) across all couples, though, was 5.4 minutes
美國調查了500對情侶
做愛時間中位數是5.4分鐘
範圍從33秒到44分鐘都有
台灣好像也有類似調查 要問泌尿科醫師比較清楚