Can someone please explain to me

the thinking behind Natalie Portman's last two film jobs? Gig 1: Black Swan, super intense year long training period, yielded a baby, a future husband, and a possible Oscar nod for her (actually, really good) performance, Immediately followed by: Gig 2: No Strings Attached: A RomCom so bad they had to stick a menstruation joke in the preview. Also, Ashton Kutcher.

maybe there's some clause in her contract that she can only work with former cast members of That 70's Show?