I'm going to preface this review by saying while I don't think an anime like XL Joushi really needs a review, there aren't any reviews out there for this show yet and I'm sure there are people who don't understand that side of anime.
Starting with the story, it's completely ridiculous. Our female lead works for a condom company and she's tasked with basically doing testing on their extra large-sized condoms...by having sex with one of her coworkers who happens to have the "requirements" that she's seeking. In no way could this ever happen in the real world, and several other aspects of this show are very porn-esque (not that it doesn't suit it), but you could see this as a positive if you REALLY wanted to enjoy this show for its superficial depth of plot.
The animation I found to be quite appealing when you ignore the more explicit aspects of the show, and a lot of the exposition leading up to said explicit aspects had some decent visual humor that actually got a couple laughs out of me. However, I found the sheen in everyone's hair to be a bit off-putting for some reason, but maybe that's just me.
Sound design was nothing special and the voice actors sounded competent enough (again, when excluding the sex scenes), but still nothing really that stood out or made the show more interesting than it appeared. There were some decent jokes that they often paired with the previously mentioned visual humor, but these always appeared within the first 5 minutes of each episode.
The characters were all pretty bland in their own special way, and I'm almost positive that every one of them could be described with a single word, though the character designs were a bit better than the characteristics that were attached to them.
Now that we're at the conclusion, XL Joushi could easily be compared to this review: it's short, forgettable, and makes you question whether you should've spent the time to sit through it. As a hentai, you could let a lot of these things slide, but since the genre as a whole is more akin to a video off Pornhub and has left an undeniably perverted mark on the medium of anime as a whole, I feel obligated to rate shows such as these with the same standards we would as any another anime.