I had 2 stitches after my first - It hurt like mad at the time, and took ages to heal - I have to admit I know it sounds woossy, when you hear about people having loads of stitches, and inside and out etc, but it was horrible!
2nd time I didn't tear 
3rd time, ds2 came very quickly, at home, before the mw had arrived, so there was noone to tell me not to push, pant etc, and I tore, though not horrifically. I was on such a high after his birth, and by the time the mw had got there, I didn't really feel like being pulled about - ds2 was already on the breast, and so she had a little look, advised I probably should have a few stitches, but I said no. she stayed for a while, and once the blood loss had slowed she was happy to leave it.
It healed better than the stitches IMO.
Numbers 4 and 5 no tears 
Number 6 due early October, so fingers crossed no tears this time too!!!