reading that, it seems he just wanted the elf to stop trying to get in his pants, it didn't specificlly make him not gay, just reduce his sex drive so he wont come by every day and try to elf him in the butt.
@typeOU There may be an addictive effect because they are potions. Coupled with them actually tasting good, there is no drawback to drinking them and getting a 'high' because of the effect.
@typeOU ...did you forget one of the biggest drinks of our time, Coca Cola, was originally meant to be (I think) cough syrup? Plenty of drinks start out as medicine, some even have legit medicinal effects (teas, for example).