Well, that hardly seems fair. I know they’ll all date anyone, but you really should balance their preferences. I recall that Soliver’s favourite character was Saint Neptune (i.e. one of the two gay Saint Moon characters), which suggests he might have a more male preference… And I really think that the other four (five including Ulrich) should be completely balanced in their preferences.
(And similarly for the girls, but I haven’t paid them enough attention to know which would be where. )
I get that it’s your game, and it doesn’t have to be fair, but I’d seriously advise you to consider this.