Perspectives on Sexual & Reproductive Health Vol. 43; No. 3:
"Little is known regarding bisexual men's number of recent sex
partners, a risk factor for HIV and other STDs. Furthermore,
it is unclear if bisexual men have more partners than
heterosexual or homosexual men, and whether partner number
varies by measures of sexual behavior, identity, and
attraction," according to the study's introduction.
Using data from the 2002 National Survey of Family Growth,
sexual orientation - separately defined by sexual behavior
during the previous year, identity, and attraction - was
examined for 3,875 sexually active men ages 15-44. Chi-square
and t tests looked at differences in background
characteristics, behavioral risk factors, and number of prior-
year sex partners by sexual orientation according to each
definition. Multivariate ordinary least-squares regression
assessed predictors of partner numbers.
After controlling for sexual identity and attraction,
behaviorally bisexual men were predicted to have had 3.1 more
past-year partners than behaviorally heterosexual men and 2.6
more than behaviorally homosexual men. Controlling for sexual
identity and behavior, bisexual-attracted men had 0.7 fewer
partners than homosexual-attracted men. A model including
background characteristics and behavioral risk factors
predicted behaviorally bisexual men to have had 2.5-2.6 more
partners than others. "Neither bisexual identity nor bisexual
attraction independently predicted the number of recent
partners," according to the results.
"The way in which bisexuality relates to men's number of
recent sex partners depends on how sexual orientation is
measured. Interventions to reduce behaviorally bisexual men's
number of partners will likely lessen their risk for HIV and
other STDs," concluded the study.