arbitrary - Based on random choice or personal whim, rather than any reason or system

She felt that when the judges chose her competitor as winner of the debate, that the decision was totally arbitrary, and didn't recognize how well she had really done.
beckon - To literally or figuratively gesture with the hand or head to encourage someone to come nearer or to follow

Desire can take many forms – such as for food or physical entanglement – but when attractions beckon, it is important to move carefully and cautiously, using your head.