One possible justification is that this genital configurations prevents forcible rape, as the wiki article points out. This allows females to have more control over the genetic traits of their offspring.
I agree with you. Sorry if I wasn't clear, I just using the language in the wiki article. I guess the point is more that with a normal vaginal opening any male physically strong enough can impregnate a female. With the Hayena configuration my understanding is that the female has to consciously retract her clitoris to make impregnation possible at all.
So yes the male could still coerce, through emotional manipulation or threat of physical force, a female to comply without direct physical force but I don't know how applicable that is to hayenas (or most non-human animals).
