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It's not so much that it's hot (I mean for 90% of people, not the literal full blown cucks who are beyond hope) but rather that it's a way to keep the event hot without it being compromised by setting off "I am being cheated on alarms". Same reason it's hot or often hotter to watch solo women alone, because you get their body and energy on display without your brain having 'threat detection'. If you had to watch a woman with an actual rival, eg somebody capable of operating and competing on your level, you'd be too distracted as a red blooded hetero wanting to oust him. But watching them with horses or by themselves or with africans is a way to have a male fleshlight which isn't as threatening because it's so obviously unrealistic, making it more blatantly just a simulation of "real" sex/relationship.
If you tolerate (and by tolerate I don't mean seek out, just accept it easier because porn is degenerate anyway) it for any other reason then seriously analyse yourself
ThePornDude