5HT2A have no direct infuence on libido. Glutamate can potentiate feeling that is already there (see marijuana, everything feels twice as good), but if there is no feeling glutamate will do nothing.

There are 3 serotonin receptors directly infuencing sexual behavior -5-HT1B, 5-HT1A, 5-HT2C https://www.eurekaselect.com/55536/article Knockout mice lacking the 5-HT1B gene have shown an increase in aggression and a higher preference for alcohol.[14] Under basal conditions, knockout mice present wit...