Source: Newberger, Eli H. Newberger (1999). Bringing Up a Boy. Perseus Books.ISBN: 978-0747539674
This is a general guide for parents. From the section on gay adolescents comes this:
“In ninth grade, Dan began sexual activity with men, some in their twenties, others in their thirties or older. He meets many of them in gay clubs. He also feels confident initiating contact with strangers in public, in stores, for example. He is diligent about safe sex and careful not to make himself vulnerable to sexual exploitation by drinking too much, but he has a considerable number of sexual contacts during a year."