We have a guy we see, younger, skinny need type, bigger dick than me. He's not our bull, it's just some semi-regular sex fun we all enjoy.
I will say my very conservative mid 50s wife LOVES when he's doing her hard from behind pulling her hair or with a firm grip on her hipps.
We're not real stingers, we don't go looking for others and none of our friends know we do this.
Wife and I do kinda size people up when we're out drinking and people watching.
She has commented on black guys (with a drink or two in her) and it's always a younger, 30-35ish, tall, fit, well dressed guys.
The main reason we enjoy our not so stud-ly friend is because he's polite, respectful, clean, easy to get along with and just right aggressive.