The Messenger of Allah (sal Allahu alaihi wa sallam) said: “Protect yourself from visiting a non-Mahram woman in privacy. I swear by the One who has my life in His Hand, when a man visits a non-Mahram woman in privacy, Shaitaan is always between them. It is better for any one of you to collide with a pig covered completely in mud than to rub your shoulder against the shoulder of a woman who is not permissible for you.” [Tabrani]
Take precautions! Don’t be alone with a non-Mahram in any place and be careful not to even accidentally touch one!