I don't think you need a girl for this answer. And I'm sure, with the amount of posts contained on a forum like this, you probably don't even need this thread for this answer.
But hey...
+: It's big. It stretches. It fills up. It feels good. "There's more to love" (and the quote actually isn't a joke...). Visual appeal.
-: It can hurt in many cases. It takes more care/gentleness. Can exhaust lube quicker in some cases. Some activities are generally more difficult, if at all practical. It can be hard for some to adjust to less, if they got used to having more and really liked it.
Yeah, I know. Those were really hard to conceptualize... :sigh1: