"There is general truth to some stereotypes."
And a boatload of untruths. As a person of (undefined for this conversation) color, I've had (mostly US) providers make assumptions based on my race and general build. ( Very slender.) The only provider I've stayed with for almost a decade is 4" taller than me (before she puts on her high heels) and is 100% German. It has nothing to do with size(s). It has everything to do with being with a partner that is comfortable with her own needs and desires and trusts you with them. When someone hands you the operating manual to their sexuality, take the time to read it and ask questions.
If there's a stereotype to learn here, is that men (in general) don't read the instructions, and as a result, don't get the best possible outcome. Find a lady who is very open about what she likes and how she likes it and don't be afraid to become her student. Make her needs more important than yours and I promise you will be rewarded with satisfaction 100 times over.
I'm over 70, have had a heart attack, had prostate cancer that has had a definite effect on my ability to perform, but I'm having the wildest, kinkiest, most satisfying sex of my life! All because I found a lady who has her sexual self confidence and was unafraid to talk about her needs and hot buttons.