Movie stars often keep mum about their experiences, but when it comes to bad on-screen kisses, some Hollywood actors are not afraid to spill the beans.

While audiences have witnessed iconic smooches that have left a mark in cinematic history, not all kissing scenes were as magical behind the scenes.

From slobbery embraces to unpleasant breath encounters, here are some of the worst on-screen kisses in Hollywood.

Brazilian actress Morena Baccarin had to lock lips with Ryan Reynolds while he was suited up as the superhero Deadpool for the 2016 Marvel film.

She likened the experience to kissing a “latex condom,” noting that the encounter emitted a strong rubbery odor throughout.

Despite Angelina Jolie being a fantasy for many, James McAvoy didn’t enjoy his kiss with her in the 2008 action movie ‘Wanted.’

Describing it as uncomfortable and sweaty, McAvoy revealed that the on-screen moment wasn’t as pleasant as expected.

The upside-down kiss between Tobey Maguire’s Spider-Man and Kirsten Dunst’s MJ in the 2002 blockbuster posed challenges during filming.

Maguire shared the difficulties faced while shooting the scene, including being hung upside down in the rain with water running up his nose.

Even though Marilyn Monroe is an enduring Hollywood icon, her co-star Tony Curtis didn’t relish their kiss in the 1959 classic ‘Some Like It Hot.’

Curtis compared the experience to kissing Adolf Hitler, emphasizing that Monroe’s forceful tongue maneuver almost suffocated him.

Actress Helen Mirren, known for her role in ‘The Mosquito Coast,’ criticized her co-star Harrison Ford’s on-screen kissing skills, suggesting that he struggled to deliver convincing kisses both on and off-screen.

Liam Hemsworth fell victim to Jennifer Lawrence’s pranks during their kissing scenes in ‘The Hunger Games’ series.

Hemsworth disclosed Lawrence’s habit of consuming garlic or tuna fish before their on-screen kisses, aiming to make the experience as unpleasant as possible.

Helena Bonham Carter complained about Woody Allen’s stiff and non-engaging on-screen kissing technique during their collaboration on ‘Mighty Aphrodite.’

She described the encounter as devoid of any passion, akin to kissing an immovable object like the Berlin Wall.

Kate Hudson, who starred opposite Matthew McConaughey in ‘How To Lose a Guy in 10 Days’ and ‘Fool’s Gold,’ was put off by McConaughey’s kissing habits on set, mentioning discomfort with the unexpected occurrences during their kissing scenes.

Emma Watson opened up about feeling awkward and almost incestuous when she had to kiss Rupert Grint, her close friend and co-star from ‘Harry Potter.’

Watson recalled the nervousness and confusion she experienced during their on-screen kiss, eager to get it over with quickly.

In ‘Water for Elephants,’ Reese Witherspoon and Robert Pattinson shared an uncomfortable kiss due to Pattinson’s bad cold at the time.

Witherspoon highlighted the unappealing nature of the scene, attributing it to Pattinson’s runny nose that made the experience less than pleasant.