I have personally never heard of wasps being attracted to BBCs specifically. However, people with a darker skin complexion have more melanin in their skin. Melanin is very useful for protection from the sun but it does have a few drawbacks. One of them being that it makes it so you cannot produce as much vitamin D per unit of sunlight hitting your skin. Another is that it makes your skin more attractive to wasps and other critters such as raccoons and bears. Critters obviously includes mosquitos as well which is why so many people in Africa are dying of Malaria as opposed to people in Europe. Malaria is approximately equally present worldwide, but mosquitos generally go for melanated people more and thus they spread malaria to African people more.
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