We've noticed in surfing the net/personals etc that a lot of husbands/boyfriends in "cuckold couple" relationships actually have fair to good size endowments... Not many nor most, but several...
Which leads us (we're "virgins" still planning her first) to believe that this fantasy is both physical and mental. Not sure or even able to guess the percentages on that, but...we see a lot of real pics and videos where hubby is involved or watching etc and he's hung twice as large as half the white guys on the driveway planet LOL..
So the mental aspect ( "Fucked by another guy"... "Fucked by a black man for the first time"..."Cheating on my guy but he's approving".. etc etc) must be quite intense, no? That whole psychological thing must play a major part.
Melissa (wife) and I are in the early planning stages of this right now but as we begin the search for a "Bull" for her, we've already discussed the fact that the stud has to be "hung big and thick" (unlike my "tiny useless little dick".. her exact words quote)..
Strong enough to "Manhandled" her (she's your typical 53 year old, Italian-American, Boston area housewife, a bit overweight.. pic below) cuz if she's fantasizing about black guys it's ALWAYS a strong, fit, in-shape dude, or if we're walking through a mall or out on the town we hold hands and when she sees a guy who attracts her we have a "secret code" so to speak, where she takes her middle finger of the hand she's holding mine with and she gently "tickles" my palm, signifying her "Ooo, I'd love to have him fucking me" thoughts...and 99.9 percent of the time it's a dude who is bigger, taller (I'm 5'9" and in very good shape for 56 years old), is clearly stronger, built better, could probably kick my ass up and down Main Street if he chose to etc etc.
So I guess that the answer is "Yes", at least for us, he's gonna have to be very, very "fit", muscular etc so that she'll have her strongest (pun intended) fantasies about this actually come true...
I'm pretty sure it wouldn't be as memorable if her first "Bull" has a thick ten inch cock but was built more like Cedric the Entertainer than if he was a Shemar Moore, or Denzel Washington, or (etc etc) LOL And we do NOT mean to be demeaning or condescending etc in saying that, just that for us? ...We'll be "recruiting" a Shemar for her instead, cuz he's her "type" for this hopefully wonderful experience we're (hopefully) going to have!