Badly-fitting condoms can diminish the fun of sex for both men and women and also increase the risks of pregnancy and disease as they are more likely to split.
That is according to a new study by scientists at the Kinsey Institute, which revealed that nearly half of all men have used condoms that do not properly fit in the past three months with a female partner.
Among the 45 per cent of men who admitted to this, the incidence of reported condom breaks and slips was twice as high as among those who used proper-sized sheaths, the study in the journal Sexually Transmitted Infections revealed.
These men were much more likely to complain of penis irritation and diminished sexual behaviour on the part of both them and their partners.
"Men and their female sex partners may benefit from public health efforts designed to promote the improved fit of condoms," the scientists concluded.
The Kinsey Institute for Research in Sex, Gender and Reproduction was set up at Indiana University, US, in 1947 by Dr Alfred Kinsey to study human sexuality.
Its reports have been credited with doing much to dispel some of the outdated views about sex that prevailed throughout the country in the first half of the 20th century, paving the way for the sexual revolution of the 1960s.