One day he went into the house to attend to his duties, and none of the household servants was inside. Genesis 39:11
Joseph knew that danger lurked around the corner. Potiphar's wife had her eyes on him, and she was watching for the opportune moment to tempt him. Despite his continued rejection, she hoped a day would come when Joseph's defenses were down. Every man is weak at one time or another. Potiphar's wife was simply watching for Joseph's time.
Why did Joseph go in the house alone? He knew what could happen. I'm sure he felt that he could stand strong as he always had. Stand strong is what he did.
Once again, Potiphar's wife seduced him. Once again, he rejected her. This time it backfired. She took revenge. Joseph was unjustly accused and unjustly thrown in jail. It would have been better if he had never gone in the house at all.
The interesting thing is: before this time, Joseph took special care to not be with Potiphar's wife. He was the boss of the house! Why didn't he protect himself this time by ensuring the other servants were present? Maybe he felt the danger had past. Maybe he felt he could handle whatever came his way.
Lord, there are times that I know I can stand strong, so I might choose to go closer to danger than I should. Wouldn't it be wiser to stay away altogether? I know I cannot hide from temptation. It will find me regardless. But help me to discern Your plan. If I should enter a dangerous place, surround me by Your Spirit and the protection of my Christian brothers. Too often, in my pride, I cross the threshold into danger, and I am harmed. Help me to learn from these lessons. Help me to be righteous as Joseph was righteous. Give me wisdom, so You can be glorified.