If not, then PERSONALLY (only my opinion!) I would be leaning towards a caesar but I would certainly discuss further with your OB and be guided by her advice. If your condition is so severe that you tear during normal intercourse I would be very concerned that, even with an episiotomy, you would tear uncontrollably during delivery. This may have huge implications not only for your physical healing, but also for you mentally and emotionally. Although there are risks associated with a caesar, I assume your risks are no greater than any other woman's.
Going by what you have said (and me having no knowledge of the condition you have) I have similar thoughts to this. The tearing anyone experiences is quite unpredictable before the birth, so you are never going to have any good solid information to base your pro and con list about going for v. delivery, so what you feel comfortable with is the best way to go.

Good luck...x