promiscuous - Lacking discretion or selectivity, especially in choosing relationships or associates; mixing or combining things randomly.
The character in the novel was portrayed as promiscuous, frequently engaging in relationships without commitment or emotional attachment.
shortcut - A simplified way to complete a task, often by bypassing steps in a process; or a path or way that reduces the usual time or distance required to reach a destination.
He surprised the teacher by figuring out a shortcut method of solving the math problem that saved time compared to the method she had taught before.