Here are some reasons I could think of...please feel free to add...
1. Babies don't come cheap...they mean expense and more expense from the time of conception onwards...
2. Babies mean no sleep...because they bawl through the night and need to be fed at regular intervals...

3. Babies don't come potty trained...Diaper change is daddy's task!
4. School admissions are a nightmare! The queues, even to get application forms, are serpentine!
4. Home work and assignments are actually meant for parents!
5. Teenagers are all about loud music and late-night parties...

6. If we have a daughter, you will have to chase the boys away!

7. Your son may steal your car for the prom night to impress the girls and crash it!
You think Ashutosh will still want a kid?!