Mary is open to having sex with men of any race as long as she finds then sexy. She has fucked a lot of black men from one on ones to 3 somes and even a few all black gang bangs.
She does tend to be a bit more submissive overall but not always.
She has found as partners their size varies as does their talent.
Funny thing is the first black guy she had sex with (friend of ours who was over playing poker when Mary decided to initiate a gang bang), she did not really think about it until afterwards when in the post sex relaxing she suddenly blurted out "omg I just had sex with a black guy for the first time!"
I love watching her with all sorts of men but yeah the contrast is great, especially when she sucks their cocks, how much some of them love cumming inside a white wife, etc it's all great