I believe so. Usually men admit to it more in higher numbers than women do. However surveys aren't always that reliable.
There have been studies that claim anywhere from 1 in 500 births are attributed to the wrong man being "the father" and some articles have claimed the number is between 9% on up to 30%. (Seems extreme)
There have also been instances of "paternity fraud" cases challenged in courts around the world.
One thing is for certain is infidelity or cheating is (much easier) to accomplish than it ever has been. Some websites and phone apps established their business by making it easy for "interested parties" to connect. Nevertheless it's reported the work-place is still the number one place where cheaters find a partner for "affairs".
Essentially this would indicate in today's era people don't necessarily have to "hide" the fact they're married. There are lots of people who are willing to have sex with married or attached people.
Anyone who has ever seen an episode of "Paternity Court", "Cheaters" or "The Maury Povich Show" AKA "You are NOT the father!" is clearly aware that neither gender is standing on "holy ground" when it comes to cheating. In fact lesbian couples report many instances of cheating as well.
Last but not least cheating is defined differently by various people!
Some folks will say their mate cheated if they viewed pornography online, corresponded with someone in "chat rooms"/online, sexting without ever meeting in person, having "secret friendships" where one meets for lunches and confide in one another, right down to catching their mate flirting....etc
A person in a relationship or marriage who participates in sexting photos may not consider themselves to be "cheating" while their mate would.
Sometimes cheating is in the eye of the beholder!