The 'Mamma Mia!' star has worked with people like Channing Tatum, Justin Timberlake and Dominic Cooper in her films, reported Us magazine quoting her interview from W magazine.
"Sex scenes are great. A lot of my costars have been sexy guys my age who are really respectful and cool. So, why not? I'm not going to pretend it's not fun," the 28-year-old star told the magazine.
She also has fond memories of her lovemaking scenes with Megan Fox for 2009 horror comedy 'Jennifer's Body'.
The actress feels that it is impossible not to fall for her co-stars sometimes after spending so much time shooting a movie.
Seyfried, who was linked to actors like Micah Alberti, Cooper, Emile Hirsch, Alexander Skarsgard, Ryan Phillippe, and Josh Hartnett, is currently dating Justin Long.
"When you're young, it's hard not to get together with your costar. It's not always a great idea, but the experience of making a television show or movie is so intimate and romantic.