In a world where people have made tank dating simulators and dating copy-machines, dating one's weapon doesn't seem too far off...
Transistor a guy is trapped in a sword and you get other people to do power combinations.
Well...
Let Yahtzee explain it. --Adult hurmor warning--
In Disgaea you can enter your weapons and level them up to make them stronger (
and a level 10 anything is far stronger than anything you'd buy)
In Ar-Tonelico you 'date' (
well date is a loose word for it) your revetails to have them do higher abilities and spells, and they are effectively weapons.
Hatoful Boyfriend is on gog and you're interacting with and dating birds...
I don't really see the problem.