研究是在线发布的，发布在《进化和人类行为》杂志最新一期之前。
The study was released online in advance of publication in an upcoming issue of the journal Evolution and Human Behavior.
2007年刊登在进化和人类行为期刊上的一项研究发现，夜店的舞女在生育力旺盛时期，得到的小费更多。
Another study, published in 2007 in the journal Evolution and Human Behavior, found that lap dancers raked in higher tips when they were most fertile.
也许这是打哈欠进化为社交线索的一种暗示——“到我们大家睡觉的时间了”——不过，像往常一样，当进化和人类行为相遇时，推测充其量只是纽带。
That may be a hint that the action evolved as a social cue - "time for us all to go to bed" - although as usual when evolution and human behaviour meet, the tie is speculative at best.
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