What is so hot you about cuckolding?

Complex set of emotions. Seeing/hearing her release her inner slut I guess. She is a shy conservative Filipina wife who is loyal and subservient in every way you could expect. But she has a huge sexual appetite which I have enjoyed over nearly twenty years. But, being 20 years younger than me she still has a hunger I can not really satisfy. Having let her off her leash it's a huge thrill to see her indulge her lust for different cock. Just knowing how she can orgasm it's a real thrill to imagine, hear or see her spread out and being used .... which I know she loves.