Yes, anand, depending on the level of trauma that her uterus was put through and how well things went, how she healed, her risk of infection, her risk of the incision busting, and a whole host of other things, this is absolutely a legitamite request. You see, when one has a C section, because of the trauma that the uterus goes through, if one has sex too soon you can actually cause ruptures of the incisions, hemorraging of the uterus(severe bleeding.. can actually be dangerous) and or infections of the area, which if severe can actually result in having to have a hysterectomy.

Now granted the majority of time this never happens, but its for the best. Like someone else suggested, this doesnt mean you cant be sexual AT ALL. There are tons of things you can do to please each other. Ask the doctor if she is allowed penetration at all - if so, then fingers might be ok for you to please her with. However the doctor might nono this too so ask first.