We conducted an in-depth investigation on whether college students who missed the last train, when guided to a love hotel and left alone together until morning, would end up having sex even if they were just real friends. A male and female friend who hadn't previously considered each other romantically suddenly became highly aroused in the atmosphere of the love hotel! She accepted the real penetration, experiencing intense piston-like thrusts that reached deep into her uterus, climaxing repeatedly and surpassing the barrier of friendship, without thinking of the consequences, engaging in continuous unprotected sex! They can no longer go back to being just friends!!