夫妻间的性协调,就好像是两个人合伙投资搞生意。买卖做得好坏,最重要的因素就是双方投入的东西与所获得的东西是不是基本相符。没有人愿意在一种合作关系中老是吃亏,也无法长期容忍另一方老是占便宜,因此床上需要平衡术,不需要跷跷板。可是许多夫妻实际上并不懂得这样一个浅显的道理。 Sexual coordination between husband and wife, as if two people invest in business partnership. The most important factor in doing business is whether the things put in by both sides are basically in line with those obtained. No one wants to lose always in a partnership or long-term tolerance of the other, which is why the bed needs balance and does not require seesaws. But many couples actually do not understand such a simple truth.