"Being a single guy can be a lot of fun…when you're financially independent [and] can do whatever you want, whenever you want," Kutcher, 36, told Men's Fitness this month.
"For every girl you have a good time with for one night, if you want to stay single, that's the same girl that you have to not call back," the Two and a Half Men actor continued. "After a while, being the one-night stand guy is also just a little gross."
Us confirmed on Feb. 27 that Kutcher and Kunis, 30, became engaged after nearly two years of dating. Kutcher previously was married to Demi Moore, 51, who then split following his infamous fling with San Diego college student Sara Leal.
As previously reported back in October 2011, the Jobs actor had a one-night stand with a then-22 Leal at the Diamond Suite at San Diego's Hard Rock Hotel on his sixth wedding anniversary with Moore. At the time, Kutcher said he was separated from the Margin Call actress.
Sign up now for the Us Weekly newsletter to get breaking celebrity news, hot pics and more delivered straight to your inbox!