I dont think so, homosexuality is abnormal, as abnormal is the incapacity of any living being to reproduce. I can confirm that indeed increasing serotonin levels can changes sexual orientation. I used to be a bisexual suffered also of depression and anxiety as many gays do. Well so interesting many medications fail to treat my depression but after many trials I found one that help me: Hydergine. Hydergine made disappeared all my homosexual atractions but by libido is still OK. Chinese scientists have shown that low serotonin levels in rats make them homosexuals and I read this after have tried Hydergine!! so no placebo here!