This study was carried out to prove the nature of love which adults with intellectual disabilities had experienced through a phenomenological method. The questions of the study were followed: first, what do adults with intellectual disabilities perceive love in their heterosexual relationships? second, how do adults with intellectual disabilities express their love in their heterosexual relationships? third, what influences have love experienced by adults with intellectual disabilities in their heterosexual relationships on them? For this study, The major findings of the study are as follows: 1. adults with intellectual disabilities perceive love as criteria for making choice of partner, ①emotional intimacy, ②double-mindness of desire and resistance, ③acquisition to a normality and a self-disclosure, ④making boundary between sex and love. 2. adults with intellectual disabilities express their love by ①physical closeness, ②spoken language, gaze, facial expression, and gesture, ③caring and sharing. 3. adults with intellectual disabilities in love are appeared to be ①spontaneous maturity without being forced, ②out of loneness into happiness and anxiousness, ③pursuiting of privacy and of what is forbidden, ④overcoming ignorance and inexperience, ⑤expressing consciousness of his or her own sexual life, ⑥ revealing unstable morality and values of sexuality.