Simple answer is "Google It."
Complicated Answer: Haven't a clue... you haven't told me who this person is. Sure, I can pick him out of a crowd kinda... but that's not why I read stories... I read it for characters who are interesting. I can assure you I've gotten into the mind of a lot of characters who look nothing like me and enjoyed them for who they are. Because when you get down too it, how your character is going to act is about who they are... not what they are... All you've told me is he played sports... okay, lots of people play a sportsball... some for fun... some are competative... some are doing it for a career...
And while his sexuality MIGHT have an effect on his response to the trauma, his skin color will be less determinate (there might be some cultural stigma from his upbringing and home life, which might be determined by his race, but trauma coping is very much colorblind in this sort of situation.).
Interview is still viable, just be upfront and respectful of boundaries before you do it. People deal with trauma differently and some people will talk about it... and those that don't might be persuaded if they knew they could help someone else in this situation. In other situations, it might help because they can distance themselves from their own experience through explaining it via the character development.
Another resource is to search for people who specialize in therapy for this and ask them to discuss it without naming names. You'd be surprised what information experts will give you if you end your ask with "It's for a book."
Finally, as mentioned, I'm not sure racial componants will factor heavily and since male victims of sexual assault are rarer (at least documented by those who come forward) it might be that there hasn't been a significant study on race as a factor to yield conclusive data, especially given that the field is very subjective in general and new. Which means you might have to look beyond skin color to get your answer.
I will leave with this one... what you have described is what your character looks like... but as the old adage goes, "Character is what you are in the dark."