Being indecisive about everything is quite possibly one of the most frustrating qualities in a man. Women love a man who knows what he wants, and the ability to make decisions is definitely tied up in all that. Sometimes it's great if you can decide on a restaurant and tell her that's where you're going tonight. Always leaving it up to your partner can be annoying and not a turn on at all.
A lot of the reason why men tend to leave some decisions to women is because they're worried they're going to make the wrong choice. But the fact of the matter is that we'll appreciate you making the decision, even if it wasn't the best one you could have made. Don't be afraid to step up and take the reins - it's far more attractive than not doing it.