Only once with a white guy I think.
This was DV-1166, 「ベッドで学ぶ英会話」 (Learning English Conversation in Bed) from 2010, which i really loved, even tough it's censored. Pulled the DVD to review it again for us.
Yuma (b 1987.03.24) is 158cm tall, and had 96H-58-88 measurements in her prime, which chestnut eyes and hair framing her oval face that showed a perpetual smile unless she was moaning with passion. As a performer, she usually presented as a 美痴女 (bitch-jo) type, but her cuteness and bright personality kept her wantoness from appearing to be as slutty as some other actresses. Her breasts were also cute - enormous but firm and bouncy with bright pink nipples surrounded by large diameter aureolae. They were complemented by hips that flared 30cm from her waist, and large, meaty well-shaped buttocks. A pair of dimples in the small of her back added to her healthy and powerful feminine attraction. Since there is no uncensored film of her vagina, we can only be certain that it was in large part pink. Yuma kept a fairly thick but well-trimmed bush of pubic hair.
While most promotional modeling poses and DVD covers focused on her sumptuous bust, when performing it was the way she used her breasts and hips in combination that makes her work especially stimulating. Since it was not possible to see her joining her genitalia with her partners, Yuma mastered the erotic arts by learning to move her hips powerfully in a variety of coital positions, especially when riding cowgirl or receiving her partner from behind. Her energetic gyrations caused her tits to bounce and sway in the hottest, most irresistible ways.
Yuma performed from 2005 – 20012; DMM ranked her the top JAV actress in 2006 and 2007. A diagnosis of pre-cancerous ovarian tumors and subsequent chemotherapy ended her career. She still makes occasional public appearances, which is a joy to us all.

Scene 1 - "Steve"
Yuma enters her first "classroom" to meet a slim, bearded, tattooed fellow of medium height who quickly persuades her that she can learn a lot while they play, and they can study more later. As they fondle each other they exchange vocabulary until Steve yanks down Yuma's panties and goes down on her furry mound to her squeals of delight. When it comes time to return the favor, she doesn't spend much time marveling over his tool, she just learns that it's called a "dick" and the objects in the sac below it are "balls," then she begins to apply her mouth to the task. Eventually Steve gets Yuma on her back and she acquiesces to receiving his penis (without a condom). The breathing gets heavy fast, and Steve allows how much he loves his job, while Yuma lets him know his fucking is "very good." They exchange places and Yuma rides him cowgirl face-to-face, grinding her pelvis against him as only she could. Steve then positions Yuma on her hands and knees and mounts her doggy-style. This section is way too short, as it displays Yuma's wide butt (Steve spanks her, we all wish we could) and pendulous breasts in the best possible way, and their pumping here enters a higher gear. Yuma appears to be most stimulated at this point, gasping open-mouthed as she pushes her hips back against Steve's thrusts. They return to missionary for a few more bounces before Steve dismounts, sits Yuma at the edge of the bed and begins jerking off in front of her. With her encouragement, Steve releases jets of semen onto Yuma's bodacious ta-tas, then she licks their shared juices off his penis to finish up.

Scene 2 - "Luke"
Another slim guy with more wispy facial hair and two earrings. After introducing herself, Yuma begins the lesson asking about his first sexual experience, and dives into her textbook for a few more phrases before asking if she can disrobe him. Yuma stretches Luke out on the bed and strips hip to his shorts. When she pulls them down, she marvels, "beautiful!" this time. Declaring, "I love dick!" she fellates Luke with considerable enthusiasm, and is able to take about half his length down her throat. Removing her bra, Yuma let's Luke squeeze and suck her breasts while she continues to stroke his cock, but then Luke moves a hand between her legs and with that, the panties come off and Luke gets a taste of Japan. Luke appears to be quite talented at cunnilingus as Yuma sighs deeply, squeals and pulls his head closer to her crotch. Sixty-nine follows, with Yuma on top for an apparent orgasm.
After a few more licks they agree to intercourse, and Yuma slowly sits down on another uncovered foreign penis. She appears to like this one more than the first, complimenting Luke on his size and hardness. After considerable bouncing and grinding, she leans back and spreads her legs so he (and we) can see his rod disappear into her cunt. More bouncing and grinding follows, then Yuma switches to reverse cowgirl, working those hips up and down to please them both. Luke loves her butt, and repositions Yuma to take her from behind. This again is the most intense part of their intercourse and very stimulating to watch. Hopefully Yuma really got the orgasms she appears to experience at this point. Yuma then asks for missionary, and Luke thrusts into her from his knees, banging Yuma hard so that her breasts shake up and down. This prompts more delighted squealing and a cry of "I love your dick!" Luke reaches his limit, pulls out and ejaculates on Yuma's breasts. Yuma fellates him deeply again after this, making loving eye contact all the while. "Oh, big dick! Surprised!"

Scene 3 - "Alex"
This guy is more of the silent type; blond, also medium height, with glasses and a bandana on his head. Yuma says she's been told his penis is beautiful and asks to inspect it immediately. She discovers that Alex indeed has the kind of toy she likes and quickly sticks it in her mouth to encourage him to hardness. Alex appreciates her enthusiasm, and also takes notice of her abundant bust. Yuma pulls down her top and bra straps so he can cup and squeeze her tits while she continues to suck him off. This leads to a short titty fuck before Yuma is back on her knees with Alex's cock between her lips, stroking and sucking him for all she's worth. Alex begins thrusting his hips and it becomes clear he won’t last; he takes his rod in his own hand and shoots a load across Yuma's chest, then thanks her as she licks the remaining spooge off his pink cock.

Scene 4 - "Rick"
Rick is on the chubby side, apparently European, and sports a goatee。After a quick vocabulary check, Yuma proclaims, Let's do it!" and the kissing starts. They help each other strip and share some nipple play first, then Yuma pulls out Rick's tool and begins applying her talents. After a while she asks Rick if he'll lick her pussy and she sits on his face, while continuing to fellate him. She dismounts and holding his penis, asks Rick, "Can I put it in my pussy?" There is only one possible answer, and Rick is on top of Yuma as soon as she lies back. After considerable humping, moaning and sighing, Rick asks Yuma for back and she presents her hindquarters for him to do with as he (and she) pleases, which he does. Their pace in doggy was slower than in the earlier scenes, but still pretty erotic. Eventually Rick pulls out and asks Yuma to let him release, and she encourages him with her mouth and hand until he approaches climax, then lets him drop a thick white glob of semen on her face.
In all, about as good a selection of scenes as you could hope to find in a censored production from a mainline studio fifteen years ago. If you have limited time, Scene 2 stands out as best of the four. It’s too bad Yuma never crossed over to do uncensored action, this would have been sensational, and even more so if she’s allowed the guys to inseminate her. Nevertheless, if you like Yuma (and who doesn’t?) download this title or pick up the DVD.