I have 3 kids form my first marriage, and now have 2 ( step kids) more from my second marriage. Being a parent is easy. Being a good parent isn't! You have to make a lot of sacrifices as a parent. Not to mention all the $$$ it costs to raise them. And those nights you stay awake half, if not all night ,when they are sick, and you still have to go to work. Whewww...
But all-in-all; I wouldn't trade it for anything in the world. My kids are the BEST thing that ever happened to me! Now if only they could go to work for me when I'm sick 
So, if your thinking about having kids some day?? be prepared to be broke most the time. Be ready, and willing, to watch lot and lots of PBS kids programs. And also, you and your spouse's sex life to be at an all time low!
Don't say I didn't warn you.