If you liked the Virgin na Kankei manga, the Anime-Planet community thinks you'd like:
Daikichi is the epitome of unlucky. He's just lost his job, and what's worse, he unknowingly moves into an apartment where a girl once committed suicide. Though as luck would have it, he discovers that she's still floating around, and is a lovely, kind ghost – the kind of ghost that Daikichi quickly falls in love with, physical body or not. Together, the two live day to day, having sex at every opportunity, and slowly falling deeper and deeper into love.
While Itoshi does have a romance subplot (and I say subplot given it's definitely secondary to the nonstop sex), both of these manga focus almost entirely on explicit sex. So if you liked it in one, read the other.
When Akiyama booked a vacation for him and his girlfriend at Koibana Onsen – a place known for helping unite couples both mentally and physically – he had no idea that they’d break up days before the trip. After arriving solo and meeting the onsen’s three sisters, not to mention getting the ‘special treatment’ from each of them to help him feel at home, Akiyama decides to stay and work part time. Now, with one of the sisters as his newfound girlfriend, Akiyama will work together with the trio to help make each couple’s visit a pleasurable and exciting success, in addition to losing his virginity and discovering the ultimate pleasure himself…
Koibana Onsen and Virgin na Kankei are two manga that likely will only be enjoyed by those who want hentai-level sexual encounters (as both are completely filled with them). There's an underlying romance plot and often a variety of girls to choose from, but ultimately both boil down to the same thing: graphic, explicit sex.
Hideo Aiba is anything but popular. Not only is he a high school virgin, he's also a part of the "Roman Club" – a group of guys with bizarre fetishes. But Hideo's unusual school life is changed forever when the mysterious Kurumi transfers into his class, joining the Roman Cub soon thereafter. Together, the two begin a strained and pleasurable relationship where Kurumi controls Hideo's very desires... and actions.