My wife loves to be fucked by her ex black boyfriend by behind

Along more than 10 years being married, my wife and me have had sex basically in missionary hundreds of times. Some times we have made it with she on top, and just in four or five ocations, we have had sex in doggy. I could make her cum in doggy, only once. I don’t know why, but I felt she wasn’t feeling pleasure in that position. Ithought doggy style was not good for her, but she told me that doggy position turned her on a lot.
During our secound date with her ex black boyfriend Axel, I asked them to fuck standing by behind. During the fuck, Axel shaked his hips in circles, like they were dancing an erotic dance. Susie could cum at least 4 times until he finally reached his own orgasm.