Although the term "safe sex" was primarily used in reference to sexual activity between men, in 1986 the concept was spread to the general population. Various programs were developed with the aim of promoting safe sex practices among college students. These programs were focused on promoting the use of the condom, a better knowledge about the partner's sexual history and limiting the number of sexual partners. The first book on this subject appeared in the same year. The book was entitled "Safe Sex in the Age of AIDS", and had 88 pages that described both positive and negative approaches to sexual life. Sexual behavior could be safe (kissing, hugging, massage, body-to-body rubbing, mutual masturbation, exhibitionism, phone sex, and use of separate sex toys); possibly safe (use of condoms); or unsafe.