1) Phone conversations are over in 30 seconds flat.
2) You don't care if someone is talking about you behind your back.
3) Your bathroom lines are 80% shorter.
4) Old friends don't give you crap if you've lost or gained weight.
5) When clicking through the channel, you don't have to stall on every shot of someone crying.
6) You don't have to lug a bag of useful stuff around everywhere you go.
7) You can leave a hotel bed unmade.
8) When your work is criticized, you don't have to panic that everyone secretly hates you.
9) The garage is all yours.
10) You never have to clean the toilet.

11) You can be showered and ready in 10 minutes.
12) If someone forgets to invite you to something, he or she can still be you friend.
13) Your underwear is $10 for a three pack.
15) None of your co-workers have the power to make you cry.
16) If you're 34 and single nobody notices.
17) Everything on your face stays its original color.
18) The remote is yours and yours alone.
19) You can quietly enjoy a car ride from the passenger seat.
20) Flowers fix everything.
21) You don't have to remember everyone's birthdays and anniversaries.
22) Three pair of shoes are more than enough.
23) If something mechanical didn't work, you can bash it with a hammer and throw it across the room.
24) You can say anything and not worry about what people think.
25) You have a normal and healthy relationship with your mother.
26) You don't have to clean your apartment if the meter reader is coming by.
27) Car mechanics tell you the truth.
29) You can admire Clint Eastwood without starving yourself to look like him.
30) You can drop by to see a friend without bringing a little gift.

From a post in rec.humor.funny.reruns entitled "100 reasons why it's great to be a guy:"