AIDS? Unwanted pregnencies also
Even if it proved only 50% or 20% effective it would still have benefits, for one, reducing by 20% the amount of transmitted aids, but perhaps even if the AIDS virus is unimpeded, it might reduce pregnencies by a far larger amount.
which I guess is a good thing if you can barely afford to feed yourself, but are unfortunate enough to be sitting on the one thing most males think about the most.
So if a quick squirt of jelly each day, if it's cheap enough, or free, can do this, they might have less problems with transmission of aids (hopefully more than 20%) and unwanted pregnencies putting strain on an already strained food supply.
However, I once asked my father why people in africa have so many children and his response was that perhaps it has something to do with the harsh conditions upon which they live, in order for one child to survive, you must have 5 of them. 4 of them will die, so better to have more than let them die than to have 1 and have no family to further your genes by. So large families whilst a strain, are in fact, one of the reasons they can still live in that part of the world. So perhaps large families whilst being hard to live with because of lack of food, might be required in order to live at all.
(Weird, even in 2009, that conversation still makes sense more than 15 years later.)