Casual sex
From Tardis Wiki, the free Doctor Who reference
The participants of casual sex were named "fuck buddies" by Owen Harper, who himself did "the fuck buddies thing". After having sex with pilot Diane Holmes, Owen suggested that they have an affair and become "fuck buddies". Diane, however, believed that there was nothing casual about their encounter. (TV: Out of Time)
Sex shouldn't be devalued. Both parties should give it one hundred percent concentration. Because when you take off together it's the next best thing to flying.