The cases 9 and 19 where a negative experience for the boy and are therefore not included in JUMIMA. They can be read in the article linked below or in the book.
Source: Rind, B. Gay and Bisexual Adolescent Boys' Sexual Experiences With Men: An Empirical Examination of Psychological Correlates in a Nonclinical Sample. Arch Sex Behav 30, 345–368 (2001). https://doi.org/10.1023/A:1010210630788
Case 25 (boy 17, man 35). With a married neighbor. “… we made eye contact during lunch one day. He was very nice looking and it was very obvious that he was attracted to me. He initiated all of the contact. I was very nervous and yet very excited. We had lunch a couple of times and then he invited me over to his penthouse after work one day. I definitely wanted to go; I went on my own free will. It was a very positive experience. He was the right person for me for the first time. I knew I liked him and I knew that I wanted to do something, but I didn’t know what to do. So I let him take the lead. The first time there was no anal intercourse but we had full sex. I was also nervous because I was late for home after school. I already knew that I was gay long before this. We had several more experiences” (p. 82).