A badly fitted condom not only reduces sexual pleasure for both men and women, but also raises risks of infection and pregnancy, say experts.
A poll of 436, according to Sexually Transmitted Infections journal, reveals that males are twice as likely to take the condom off midway through sex due to a poor fit, reports The BBC.
Ill-fitting condoms more than doubled the chances of them splitting or slipping off, a Kentucky team found.
In the study, University of Kentucky researchers questioned 436 men. Of them 195 reported that their last sexual encounter involved an ill-fitting condom.
A total of 120 of these said that this had reduced their own sexual pleasure, and 57 said it had reduced it for their partner.
Simon Blake, from advisory charity Brook, said: "Standard latex condoms should fit most people but there are many different types of condoms available in different shapes and sizes and trying different types will be important in finding the 'right one'."
Natika Halil, from sexual health charity FPA, said:"Confidence and the skill of putting on a condom also contributes to how well they are used.
"Men come in all shapes and sizes and so do condoms. When we talk with men on the FPA helpline about condoms tearing, slipping off or being a nuisance to use, one of the main culprits is often something as simple as not using the right size."