If condoms were the panacea against AIDS why is it that north Africa which doesn’t have many condoms have an infection rate an order of magnitude less?
North Africa is has a much greater exchange of population with Europe thus such aids are more readily available.
Travel in Southern Spain and see the hundreds of cars loaded to the axles carrying everything including water as the make for the Ferry across the Straits.
Sub Saharan Africa is peopled, by and large, by poorer, less educated and more isolated citizens which have been engaged in almost constant wars for fifty years, that could be a possible explanation.