The chemistry between lead actors in romance movies matters. Like…a lot. Because no matter how good an individual actor is, chemistry between two people cannot be faked. You just know when something is sincere.

Couples who have solid on-screen chemistry help make the film feel believable and enhance the love story. Good casting leads to better, more enjoyable films all-around. But mostly, it helps viewers connect with the couples on a more authentic level.

As such, here are five movie couples with truly electric on-screen chemistry.

1. Drew Barrymore and Adam Sandler (The Wedding Singer)

You can’t talk about insane on-screen chemistry without mentioning Drew Barrymore and Adam Sandler, who starred alongside each other in the romantic comedy The Wedding Singer. In fact, the two even won an MTV Movie Award for “Best Kiss” in 1998 for the film! And Barrymore and Sandler’s chemistry was so undeniable they even starred together again in 50 First Dates in 2004, another romantic comedy.

2. Eva Mendes and Will Smith (Hitch)

The hit 2005 romantic comedy Hitch stars Will Smith as Alex “Hitch” Hitchens, a matchmaker who helps his clients overcome their fears and find love with the women of their dreams. Eva Mendes plays opposite Smith as Sara Melas, a gossip columnist for a New York City tabloid. The movie is not only hysterical but Eva and Will’s chemistry is palpable. They match each other’s energy in an incredibly organic, believable way.

3. Rachel McAdams and Ryan Gosling (The Notebook)

The Notebook is probably one of the most famous romance films ever made, and it’s beyond the screenplay. It really is about the sparks that fly between leads Rachel McAdams and Ryan Gosling. I mean, that kiss in the rain on the dock? Truly iconic.

4. Kate Winslet and Leonardo DiCaprio (Titanic)

I mean, duh. In the blockbuster classic Titanic directed by James Cameron, Kate Winslet and Leonardo DiCaprio’s draw to one another is nothing short of electric. Do I even need I mention the carriage scene? There’s a reason this movie is still considered one of the best after all of this time.

5. Lana Condor and Noah Centineo (To All the Boys I’ve Loved Before)

The breakout Netflix hit based on the YA series by Jenny Han, To All The Boys I’ve Loved Before introduced the world to Noah Centineo as the totally charming, popular kid Peter Kavinski and Lana Condor as quiet hopeless romantic Lara Jean. It’s the chemistry between Centineo and Condor that make To All The Boys I’ve Loved Before such a fun watch.