I don't feel an heavy "porn" vibe here. It's ecchi, but the sex feels natural and not something that come straight of a hentai, with lots of fluids and ahegaos.
For all your supposedly open mind, you people are so... conservative.
Committed relationships are a cultural thing, not a natural one.
It's not about the artistic depiction like fluids or ahegaos, it's about the character motivation. One of the characters is doing underage compensated dating prostitution and doesn't expect a woman, then goes and forces herself on her friend and tries to tell herself that it's not cheating while clearly looking remorseful and conflicted instead of happy and untroubled; said friend then gets BLACKMAILED into having sex with someone else. There's tons of cheesy "you say you hate it, but your body is being honest"/"she did that to me, but why do I feel so good...?" type of lines, because "it can't be rape if they enjoyed it!" logic, aka porn logic 101.
It doesn't matter if Kurogane's art style isn't lolis with cowtits and horsedicks and over-the-top o-faces, that's not what makes something "natural" or not. That's the same sort of thinking as "fantasy is inherently unrealistic because it's got dragons and magic", focusing on the aesthetics instead of on what actually makes something nuanced or not, which is the psychology of characters. It's porn because the co-worker just randomly starts to flirt with the characters for no reason other than that she "smells their similarities" and then instantly initiates sex, a classic porno move a la pizza guy opens the door and fucks the milf. Starting an OFFICE AFFAIR for no reason, without knowing the other person at all besides the fact that they work with you, is a ridiculous scenario. People complain about Mira's works for the "balloon tits", but, BDSM comedy ones aside, the characters actually know and like each other, which will always be far more natural than realistically drawn characters in unrealistic scenarios. This series can only be enjoyed if you don't take it seriously AT ALL. (aka how people enjoy PORN, at least usually) But if this is your idea of happy, consensual, casual sex, then yikes.
Committed relationships are a cultural thing, but you know what else is cultural? Consensual relationships, instead of in nature where one sex just forces themselves onto the other (or attracts them with... beautiful colors, objects, dances, etc. but never a winning personality) and then leaves the pregnant mate to give birth by themselves. Not everything in nature is superior to what we've artificially created.
Did Match walk through gamma radiation or something? She's seemingly incapable of drawing a single page without trying to make it the most intense page she's ever made with so much... just wasted energy. It's like a telenova written by a second-rate shonen author on speed.