Doesn't an aphrodisiac work by altering brain chemistry to increase libido? In that sense, it doesn't matter where you spray it, and spraying in on your genitals is awkward/pointless since it's not going to do anything extra that spraying it in your mouth and ingesting it wouldn't do. This guy is selling snake oil.
Also:
Some psychoactive substances such as alcohol, cannabis, methaqualone, GHB and MDMA can increase libido and sexual desire. However these drugs are not aphrodisiacs in the strict sense of the definition, as they do not consistently produce aphrodisiac effects as their main action and often actually impair function.
Emphasis mine.