I don't consider it about sex, it's more of a comedic look at, how should I put it, shenanigans. Erotica is when the content is titillating. So you guys are telling me you goon to this stuff?
For mangadex the tag definitions are:
Suggestive - Has minor to moderate amount of risqué and sensual elements. No explicit sex scenes, but can include minor nudity.
Erotica - Has a high amount of risqué and stimulating elements that contribute to the plot, including explicit nudity for sex scenes. The work is still focused on story, rather than pornography.
(Gooning works get to use the "Pornographic" tag which is hidden by default, so you might have overlooked it)