This research is about the Malay adolescent's understanding on the concept of love in Islam and its relationship with rational thinking. Two instruments were developed to measure the level of understanding, attitudes and practices of the adolescents in selected Malaysian universities embracing the concept of love through the psychological and Islamic approaches, and the level of rationality while in love. This quantitative studies involved adolescents in public and private universities with two instruments constructed specifically for this study. Through the 599 respondents this study found a significant relationship between demographic factors, category of university attended, background and status of love with the understanding of the concept of love in Islam and rational thinking. The findings are useful for increasing the understanding and appreciation of love from the Islamic perspective and to address problems arising from moral decadence stem from the misunderstanding of the concept of love.