Here's some actual scholarly work supporting the "lie" that being marginalized by society affects sexual behavior, specifically promiscuity:
Low self-esteem ranks among the strongest predictors of emotional and behavioral problems. Compared to people with high self-esteem, people with low self-esteem tend to be more anxious, depressed, lonely, jealous, shy, and generally unhappy. They are also less assertive, less likely to enjoy close friendships, and more likely to drop out of school. Furthermore, they are more inclined to behave in ways that pose a danger to themselves or others: low self-esteem is associated with unsafe sex, teenage pregnancy, aggression, criminal behavior, the abuse of alcohol and other drugs, and membership in deviant groups.
The article also mentions low self-esteem being related to "irresponsible sexual behavior," including promiscuity. ("The Role of Low Self-Esteem in Emotional and Behavioral Problems," Mark Leary, Lisa Schreindorfer, Alison Haupt, Journal of Social and Clinical Psychology 14:3, 1995).
And here's an article showing a correlation between low self-esteem among homosexuals and the negative views of the broader culture:
"Qualitative data from open-ended interviews with 76 African American men (aged 18–29 years) who have sex with men were used to examine the relationship among negative attitudes toward homosexuality, self-esteem, and risk for HIV. Respondents perceived members of their communities as holding negative attitudes toward homosexuality, and many thought the African American community was less accepting of homosexuality than the white community. There was evidence that these negative attitudes are internalized by some of the young African American men themselves. Respondents mentioned several ways that negative attitudes toward homosexuality could lead to lower self-esteem and psychological distress in young gay and bisexual men. In addition, respondents articulated several mechanisms by which low self-esteem and psychological distress might be associated with sexual behaviors that put one at risk for HIV. It is concluded that addressing and changing society's negative views of homosexuality are important components of a comprehensive approach to reducing the transmission of HIV, especially among young people in communities of color. (PsycINFO Database Record (c) 2010 APA, all rights reserved)." (Homophobia, self-esteem, and risk for HIV among African American men who have sex with men.
Stokes, Joseph P.;Peterson, John L. AIDS Education and Prevention, Vol 10(3), Jun 1998, 278-292.)
Note that negative attitudes are associated with low self-esteem, which may be "associated with sexual behaviors that put one at risk for HIV."