耍流氓是件技术活滚床单是件体力活
[shuă liú máng shì jiàn jì shù huó gŭn chuáng dān shì jiàn tĭ lì huó]
In a somewhat risque context, this implies flirting requires tact and charm ('showing off' being considered flirtatious), whereas being intimate calls for physical stamina.