.@pseudoerasmus the southern africans who marry their fbds are the sotho-tswana, NOT the shona. (sorry!) http://books.google.com/books?id=ZOeVkoNWPjkC&pg=PA42&dq=sotho+parallel+cousin+marriage&hl=en&sa=X&ei=D0ShU7XYHIOAywP9_4HwAQ&redir_esc=y#v=onepage&q=sotho%20parallel%20cousin%20marriage&f=false … (^_^)
@pseudoerasmus note, tho, that kuper found that altho mbd may be preferred among the sotho, in practice they often in fact marry fbd. (p.42)