Quickie
A quickie is short, spontaneous sex that usually happens when the opportunity arises. The main focus is on quick sexual satisfaction, so extended preparation or a long amount of foreplay is often skipped. The term describes the duration and spontaneity more than a specific sexual practice.
Even during a quickie, consent, consideration, and safer-sex rules should not be neglected. Spontaneity is no substitute for communication: anyone engaging in brief sex should still pay attention to boundaries, protection, and a safe setting.