This is a different kind of kiss-and-tell.

A sexy grandmother pursued by men who are half her age says she can tell whether a date will be good at sex simply by locking lips with him.

London-based Andrea Sunshine, 53, told NudePR.com that she doesn’t let a love interest into her bed unless they first pass her strict kissing test, describing it as “an infallible dating tactic.”

“I am audacious and I don’t like to waste time and be disappointed,” Sunshine declared in an interview on Friday.

“If they steal a kiss from me immediately, and the kiss turns me on — bingo, we’re gonna click!”

The brunette beauty, who has two young grandchildren, says a bad smooch is proof that a man can’t make her climax.

“If it’s a hollow kiss without enthusiasm, dry with a short tongue that gives me a hard time to reach, I don’t light up,” Sunshine explained.

“I don’t move forward,” she bluntly added. “I make up an excuse and leave.”

Sunshine is a social media star, boasting more than 341,000 Instagram followers who fawn over her fit physique.

The gorgeous granny has also started up an OnlyFans account where she’s attracted a slew of subscribers — including one who offered her a whopping $20,000 for a kiss.

“This indecent proposal came from a huge fan,” she explained. “He even suggested sending me a flight ticket to meet him in Greece.”

Sunshine stated that she didn’t take the man up on the offer, saying a kiss has to come naturally.

Earlier this month, Sunshine shared a post to her Instagram explaining her strict kissing rule, with many agreeing that it was a foolproof dating tactic.

“Literally agreed babe,” one wrote beneath the clip, which clocked up more than 4000 likes.

“100%,” another supporter chimed in.

Sunshine previously revealed that she works out for at least three hours per day in order to maintain her super-fit physique.

She said that her age-defying body means that she’s approached by much younger men.

”Young men have a crush on good-looking mature ladies so I get hit on all the time,” she explained. “There’s all kind of ages, there’s even some below 25 but most are between 30-35.”

While Sunshine insisted that she “doesn’t like the attention” she said she’s proud to be known for her fit figure.

“It doesn’t bother me to be called a fitness grandma,” she declared. “I am in my best shape and infinitely healthy.”