This was a source of contention much more prevalent in newer relationships than older ones, though, and it seems to be a somewhat larger issue for bisexual women: 41-42% of lesbians dating bisexuals fought about this, compared to 39% of bisexuals dating bisexuals, 31%-35% of queers dating lesbians, 33.5% of lesbians dating lesbians and 29% of queers dating queers.
Non-monogamous/open relationships struggled with this more than monogamous ones — 42% of folks in non-monogamous or open relationships fought about this, compared to 34% of the whole group.
Maybe they’re an introvert and you’re an extrovert.
Or there’s jealousy there — she doesn’t trust you to go out without her, or seems to have more fun with her friends than with you.
Money fights seem to fall into three main categories: one person makes more money than the other (or one is unemployed), there are disagreements about spending habits and saving, or tight finances overall cause general stress and tension.