It’s sort of a dumb question, IMO.
Not all mature bull buffalo are Dugga boys. Let’s start there.
Zebra & Gemsbok - females can be perfectly legitimate trophies. Better to shoot stallions/bulls, but only by a bit.
Most PG - females can be hunted, but only if it’s rational for the population in that area. In truly wild areas I’d be hard pressed to hunt females on purpose except for maybe hyena and elephant, again, depending on the population dynamics of that area.
I’ve hunted, at the landowners request, female kudu, hartebeest, gemsbok, warthog, springbok, and duiker. This is usually to provide meat when the animals are overpopulated. My good friend who is a PH and I have had plenty of discussions on this. In ranch areas, absent drought or disease, where there is minimal predation, he says about 1/5 to 1/6 of the animals need to be removed every year. There’s no way to do that shooting only males. None of it is wasted…… so how is this an ethical question?
The short version of this is “I need to remove about 100 springbok”. “I’m here to help.”
As for the rest of ethics…… I know what mine are. I’m not sure what yours are. As long as we’re honest about what we’re doing, follow the law, act in a safe manner, minimize the suffering of animals, act in sustainable ways, support each other, and encourage the continued enjoyment of this way of life, there’s plenty of room between the guardrails to have lots of enjoyment.