What the definitions mean as far as preference to mate.
Acceptable: Means that a male fox is willing to mate with the female, however he would rather prefer to mate with another female.
Well: Means that the male fox likes to mate with this species, however, still it's not his favorite.
Very Well: Means that a male fox loves this species and likes mating with her.
Extremely Well: One of the male foxes favorites. He absolutely adores this type of female and his body can easily adapt to accomodate her needs.