I think she is one of the few in Hollywood that has stayed away from that.
“Even though Mila Kunis recently admitted that she and Ashton Kutcher started their relationship as a casual thing, he was always part of the actress’ romantic history – Kutcher was her very first kiss!”
https://people.com/tv/mila-kunis-and-ashton-kutcher-recall-first-kiss-on-that-70s-show/