This is a nicely-done series. Unfortunately though, I feel like its target audience is quite restricted. So let me start by saying who will enjoy this manga: if you like LGBT+ themes and/or (light) BL, then this is for you. If you don't... it's not like you can't enjoy this, but you will probably find it less engaging than the targeted readers.
Something Bokura no Hentai is very good at is treating serious themes in a serious way. Illness, gender dysphoria and sexual hassault are only some of its themes, and they are handled quite well. The manga is not exactly realistic- at all. But it is belieavable, which I think is good, given how much melodrama and excessive angst are common today. This said, I still would have liked some more realism here and there.The story starts really down to earth, with the protagonists talking about what they will do when they get "unwanted hairs". However later on it loses some of this straightforwardness and gets more vague. For example, talking about Marika,
we are lead to believe that after going to the doctor she started transitioning. However we can never be sure, since everything is left to imagination. Hormones are never nominated, nor is surgery.
I wish Fumi-sensei was a little more explicit on the main themes of the manga. However the series is still enjoyable as is.
A cast of well-characterized and original protagonists is probably one of the strongest points. I liked some characters more than others, but their personality was always realistic and their actions/goals/thoughts convincing. I never once thought "what the heck is he/she doing?!". Everyone acted rationally and as a real human being. The character development was also surprisingly good! Adolescence is an age of change, and Fumi-sensei definitely showed it in this work.
As for the art, I think some might find it off-putting. Everyone looks extremely cute and young, even males and adults. Characters resemble chibis, in a way. Pages are often kind of empty, although sometimes Fumi-sensei makes it clear she can draw beautiful backgrounds. This makes the manga very easy and quick to read. The pace is so fast - I would probably be able to read the whole series in 3-4 hours.
My last point would be about the romance. This manga's ending was very cared-for. After reading the last page, I was satisfied with it. The manga ended, and it was clear from the last chapter. I liked it, I needed no more. Despite one big thing. Romance.
Sooo many UST! Unresolved sexual tension everywhere. There were so many possible couples, and I wasn't expecting to have clear endings for each one of them. But they should have at least made some people get into a relationship. I mean wasn't most of the chapters about people flirting anyway? What's the point of showing that if you won't make things progress? I find it a cheap way to keep the reader interested and it misleads them into thinking something will come out of it.
In the end, though, Bokura no Hentai was a fun read. It definitely kept me good company and, despite its flaws, I would suggest it.