Merely on the "not tearing" aspect... sometimes it's unavoidable... but there are a LOT of things that can be done to keep it from happening. The 2 biggest are perineal massage with a kind of oil (like putting vaseline on chapped lips) during the delivery, and not being on pain killers for the pushing stage (so that you can kind of ease them out bit by bit and hold off when you start feeling "tight". Kind of like how if you have a giant BM you don't push it all out at once... or your bum tears a bit... but rather ease it out using the sensation as a guide. I know. Gross. Sorry.)
Most OB's don't do perineal massage. The "in between" (aka cake and eat it too) option is to go through a nurse-midwife group. They're usually attached to an OB/GYN office, so that if there is an emergency at any point the OB is already up to speed on you and your chart/case. These are all L&D nurses who've gone on to get their midwifery training in addition to their bachelors or masters or phd-ships. They stay with you throughout the labor, and are waaaaaay more hands on. (You also get a L&D nurse, so you end up feeling really, ummm, pampered is the wrong word, 'cause pain + pampering I just can't quite link). You see them the same way you would see an OB (all the same tests, etc.), although I understand OB appts are shorter (mine were all 30-60 minutes of face time with my midwives -they rotated so that no matter who was on call, we had a relationship).
Anyhow... 10lb baby, giant head, and no tearing and no episiotomy. I had an epidural, but they backed off on it so I could feel everything for the actual birth (not out of choice, per se, but specifically to help with pushing and to avoid ripping).
So those are some options to consider for the next baby. Ripping is *always* possible, but massage & full-feeling help a LOT in prevention.