Re: I watched a documentary about that Chocolate Factory the other night...
I don't know how it is with chocolate and sweets in general, but in the meat industry women make up a majority of "sniffers", checking meat, especially pork*, for strong smells.
Un-castrated male pigs are called "stinkers" in the industry, their meat can give off a bad smell when cooked. This smell is also detectable when raw, but it is hard, especially for men, to detect. Women have a much better chance of picking up this anomaly. Their olfactory senses are more sensitive to this particular range of smells.
There are some jobs that are better suited to one sex or the other. But a majority of jobs these days are more about knowledge and ability than biological attributes.
Me? I can't detect a stinker (we used to supply software to the meat processing industry), but I can detect cigarette smoke at 200M...