I haven't confirmed this yet, but there was a time when I took a few pills of Echinacea + beta glucan and later that day I tried watching hardcore porn, but I was simply not aroused psychologically. I tested Echinacea drops separately and it works moderately well on my POIS symptoms, but it didn't reduce the desire.
I also took Zoloft a long time ago and it worked for me as well. If you have trouble with prescription you may want to try out L-tryptophan as it generally does what SSRIs do. However you shouldn't take Zoloft and L-tryptophan together as it can lead to serotonin syndrome. You shouldn't take more than 3 tryptophan capsules a day as I had adverse side-effects with four. I always took only one capsule and kept a few hours in-between before I took the next. Usually the second one had a really noticeable effect on my depression and vision. I couldn't notice if it reduced my psychological desire, but it definitely made my dick less sensitive, so it had a positive effect on premature ejaculation (PE) as well, although I hadn't really had a problem with that. MACA capsules also reduce sensitivity and I think this may also help with nocturnal emission (NE).
Putting desire aside I had even better experiences with MACA capsules, saffron tea and alfalfa, so you may also give them a try.