She could either

a) Leave Malaysia and just settle in the US acting to her heart's content (including those scenes) - - so even if Malaysians chastise her, no issue
b) Accept the role but use body double for those scenes
c) Negotiate so that those scenes are instead implied instead of being shown

Her agent must be

Now that she has turned down the role for such reasons, future roles maybe jeopardized even if involve small amounts of sensuality.

But it's her choice, and if that's her reason, should respect that. She's not the only actress on the planet.