Final answer:
The studies referenced do not provide specific information on breast stimulation practices among gay and heterosexual men. They focus on patterns of arousal and brain activation, indicating different responses to sexual stimuli and cultural expressions of closeness, but without conclusive evidence on behaviors during sexual activity.
Step-by-step explanation:
The question regarding how gay men stimulate their partners compared to heterosexual couples does not have a simple answer since sexual behavior is highly individual and can vary widely among different people, regardless of their sexual orientation. It's essential to acknowledge that not all men have partners with breasts, and those who do might not engage with their partner's breasts in the same way. Sexuality is a complex and personal aspect of human behavior that can't be generalized across entire groups.
The studies referenced do not provide specific data on how gay men stimulate their partners' breasts compared to heterosexual couples. However, they do offer some insights into sexual arousal patterns. The first study by Adams et al. (1996) on physiological responses to sexually explicit materials suggests that reactions to sexual stimuli can be complex and perhaps influenced by factors such as homophobia. The second study by Hu et al. (2008) discusses brain activation patterns during sexual arousal, noting differences between homosexual and heterosexual men, but without detailing specific sexual behaviors. The information from the continuum on gender expression indicates that in the U.S. cultural context, expressions of physical closeness do not always align with sexual behaviors, implying that stimulation of breasts in a sexual context may not necessarily correlate with nonsexual expressions of closeness.