Tech Boy and Friends features an interracial couple, the older hung, Black man TechBoy and his white college friend Jared. They are/were based in Seattle, I believe. Several years ago, they published a few instructional videos on gay sex on Xtube. I have copy/pasted some of the links below
[1]
How to Suck Cock
[2]
How to Fuck
[3]
Fucking & Rimming
You may also want to investigate gay tantric sex. There is a series with a German narrator who shows the same gay . male couple involved in a tantric exploration of sex. (Let me see about finding some links later). Instead of a focus on the mechanics of sex, the tantric focus focuses on how to be more aware of your partner's pleasure which, in turn, enhances you own.