A quickie is sexual intercourse that individuals engage in when the time available is minimal.
It can arise from a spontaneous sexual desire by the parties involved or be a regular or planned arrangement.
[1] In a planned encounter, the partners may dress in a manner that reduces the time needed for undressing.
For example, a woman may wear a wide skirt or a front closing dress and open crotch lingerie, thongs to be pushed aside or no underwear, especially pantyhose.
A quickie between a heterosexual couple may generally satisfy only the man's sexual desire.