Well, this is what the author wants anyway, no hentai or keep it to ecchi, because ecchi stuff may gets an anime season..
so he purposefully created the mc to be like this, the aphrosidiac however may "force" the mc to do the deed.
as a reader, would you drop the manga if he already done with one of the girls? Personally I lost interest on reading playboy sage manga, after he done 2 giant tiddy girls he's partying with. But in the end, it depends on the author how he "executes" the deed.