How did they simulate all those long sex scenes?

Both actresses confirmed that they used prosthetic molds of their vaginas for the more intense scenes, so no real sex act was ever done on film. They definitely filmed it in a way that made it very convincing.

*You met me at a very strange time in my life*

I think that the scenes were real.

This movie was so so. It wouldn't be remembered if not for the sex scenes.

Well, they were wearing crotch patches, but even if they weren't, all they had to do was NOT actually put their tongues in each others vaginas. While I admit that would be hard for me (if I was spending hours with my face buried in Adele Exarchopolous' beautiful butt), but I could do it--or, uh, NOT do it-- if I had to. I'm sure it was perfectly easy for the actresses though since they're both straight women.

"Let be be finale of seem/ The only emperor is the Emperor of Ice Cream"

The sex scene beteo Adele and Thomas was totally real. He was full on erect no condom, penis on vagina.

So what did they do with his real dick?