I don't know what it's like to become a father, but becoming a mother can be a pretty big shock. You suddenly lose your freedom, you have to plan everything, you're tired a lot of the time, you start tripping on toys...
Your life changes, especially if you're very involved in your child's life. Your priorities might change too - like you might actually prefer to take your baby for a walk than watch a game or you might feel really glad that you can give your partner a chance to go out for coffee with her girlfriends and have some time alone to get to know your baby.
Personally, I love being a mom and I can't imagine going through life without having had children, but I don't think it's for everyone and I think the sacrifice is very significant...
I highly recommend the following article:
http://www.time.com/time/magazine/article/0,9171,1202940,00.html
Good luck with your decision!
Rachel Inbar - mom of 5, ages 13, 10-1/2 (twins), 2 & 1
www.fertilitystories.com