As far as I know, there are no true aphrodisiacs, in the sense of a drug that makes you immediately want sex.
There are drugs that can give a man an erection (ex: Viagra) but that does not necessarily make him want sex.
There are drugs that can lower your inhibition (ex: alcohol) but again they do not necessarily make you want sex.
There are drugs that can even go further and knock you out (ex: roofies) but again they do not make you want sex. (And are illegal.)
There are even drugs that can cause irritation to your genitals (ex: ‘spanish fly’), which might cause you to rub them (or have them rubbed) for a sense of relief, but again they do not necessarily make you want sex. (And they are dangerous to use.)
Testosterone can affect the libido in men and women, but it is not necessarily in instant effect, but rather a general one.
In short, they don’t. Most of the things people have historically called aphrodisiacs are things that kinda, sorta look like genitalia, so they thought they might stimulate the genitalia, or at least make people start thinking about genitalia and get turned on.
One famous “aphrodisiac”, Spanish fly, is crushed up powder made from a dried beetle that contains a chemical that people used to think caused arousal. We now know that that chemical is actually a highly toxic blistering agent that irritates the urinary tract, which is not very sexy. Too much of it can cause internal bleeding, kidney failure, and death, which are also not very sexy.
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