This is a thread about the recent study by Jabbour et al., Robust evidence for bisexual orientation among men. PNAS, pnas.org/content/early/….
Phallometric testing was invented as a penile lie detector, and it is still used for the clinical diagnosis of pedophilia in sexual offenders against children, especially when diagnosis from the patient’s history alone is uncertain. 
Many people, including many gay men, have asserted that self-described bisexual men are attempting to deceive themselves or to deceive others. Throughout much of the 20th century, many experienced and sophisticated clinical experts also believed this.
Therefore the finding that phallometric test results agree with the self-reports of at least some bisexual men is genuinely informative. It is untrue that self-reported erotic preferences are sufficient, because men with all sorts of preferences routinely lie about them.
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