First of all I would say gaba would reduce the effect of your aura by creating a debalance in your brain chemistry. Or, if it’s making you unnaturally relaxed, then it could break the natural way of working your brain requires to generate the aura. Could also be because gaba slows down the connexion between your synapses (hence the relaxing effect), but the aura is less strong… The brain create the aura and your thoughts are influencing the outside world so slowing all that process down might be the cause of it (and let’s not forget that generating aura and manifesting stuff in real life is a process that demands a lot of energy!)
Second of all regarding sex. Sex with a woman will boost your testosterone and reduce cortisol. I wouldn’t have sex too often, maybe 1-3x per week to make sure you let time for your sex drive to load up fully. I am pretty sure having sex will weaken your sexual aura for a short period of time, but as you let your body becomes horny again and desires come up, the aura will become stronger. Ever noticed you are with a woman and you are fully turned of and it seems she becomes more and more turned of? This is your aura influencing her.
For me, having sex with a woman a couple of times a week will keep my sex drive strong, but if I don’t have sex for a long period of time I’ll lose libido so I think everybody have to find their equilibrium where you have sex to keep yourself healthy & having a strong sex drive(and fun also Hahaha).