Me too. I get more excited watching my SSBBW GF getting fucked by other men and taking their seed deep into her very willing pussy than when I fuck her myself. Sally also enjoys the feeling of other men cumming in her more than when I pump my cum into her.
And it's even better when you get to watch your partner having sex with another man. That's why I love to watch my SSBBW GF getting fucked by another man while I watch.