right-handed homosexual men being at an increased risk
Physiologically, recent imagistic studies have shown that male sexual pheromones act on the left hemibrain of homosexual men
(left angular gyrus, left caudate nucleus, left amygdala, etc.), while the female sexual pheromones act on the right hemibrain of
heterosexual men (right hippocampus, right parahippocampal gyrus, right amygdala, etc.) (69). In contrast, sexual hormones
might be related not only to sexual orientation (see bicalutamide) but also to the lateralized process of hand preference (see finasteride and tamoxifen). Thus, the lateralized process of sexuality (related to pheromones) and the lateralized process of hand preference (related to hormones) could be physiologically interconnected within the brain.
We predict that a very specific subgroup of men (right-handed, homosexual men, for example) might exhibit an increased frequency
and magnitude for finasteride side effects
We have already performed a study in this regard (s3, s4) that confirmed the previous expectation regarding hand preference (2),
but the number of homosexual participants in our sample was too small.  Thus, we believe a larger study including many participants, a significant number of whom are homosexual men should
help clarify (inter) relationships among sexual orientation, hand preference and finasteride adverse effects.