Mr. Answer Man says: Here's a simple rule of thumb: meeting the parents is an activity for boyfriends and "just friends." If you're more than friends but you would balk at calling him your boyfriend to his face, it's too soon to introduce him to Mom and Dad.
You should also consider this: While no guy ever breaks up with a woman because she didn't bring him home to mom and dad early in the relationship, lots of guys get scared and bolt when the invitation comes before they're ready. The degree to which a guy wants to meet your parents is the degree to which he wants commitment. But the opposite is also true: if your intentions are less than long-term, it's uncomfortable to meet the folks whose daughter you've been sleeping with. If he's somewhere in-between, you're going to run the risk of spooking him.
You've also got to take sleeping arrangements into consideration. I guarantee that the guy will be completely comfortable sharing your bed (and all that implies) under your parents' roof. If you're not -- and especially if your parents aren't -- you're opening yourself up to more potential weirdness. Be sure to discuss your thoughts with him ahead of time (meaning, before you’re pulling in the driveway.)
Romance is a game of timing, and good timing is mostly a matter of patience. If you wait until not bringing him home would actually be more uncomfortable than bringing him, you'll have a sure thing.