Studies have shown that caesarians do not provide any more protection from incontinence than vaginal births. It is not actually the birth at all that causes the most weakness to the pelvic floor muscles, it is the pregnancy - having a baby stretch and then press on them, especially in the third trimester.

Having a bad tear in your first birth is no guarantee it will happen again. It seems odd to me that in order to protect you from tearing your perineum again, your OB is happy to cut through your abdominal wall and scar you that way instead - not to mention the risks that are involved with having major abdominal surgery.

Definitely get a second opinion hun