allopregnanolone also has a difficult issue with some people, for most women it acts as a sedative / anti-anxiety / pro-dopamine response, but its been shown in studies that women with PMDD, being given allo actually gives a paradoxical response of stimulating their amygdala, fight or flight response, ie anxiety. The reasons on why is still being investigated in studies on cis women.
But this is one of the reasons Progesterone has such a dubious and hard to pin down factor with transfem health - because the same situation seems to occur.
Some transfeminine people report taking oral progesterone (which leads to high allo levels and low progesterone levels) increases their dysphoria / anxiety, some say they dont notice any sedative effects, while seemingly the majority become woozy and relaxed on it. Which aligns with the cis female response.
So it is interesting that even with this factor, the oral poll showed a very closely similar percentage of people experiencing an increase in sex drive as the rectal group who shouldnt be getting any allo in their bloodstreams or only a smaller amount (vaginal usage of prog shows zero allo conversion, but there are no studies to show if the same is true of rectal prog taking - it is assumed because the pill only goes in 1-3 inches deep it doesnt, but 6 inches deep in the upper rectum there is a large portal vein which would take some of the progesterone to the liver.)