 If you liked
Koibana Onsen
|
 ...then you might like
Ring x Mama
|
Both titles have plenty of sex scenes but aren't entirely hentai. Both are really fun to read at least in a male perspective since these are harem titles which is the ultimate fantasy of men.
The difference is that Koibana Onsen's male lead doesn't have sex with other characters besides his main love interest as opposed to Rin X Mama who openly has affairs with different women and even goes for threesomes or more rather frequently