Male expatriate medical insurance customers who are planning for a child may wish to make some lifestyle alterations to increase their likelihood of this happening.
Wearing loose pants and eating a healthy diet were recommended by fertility expert Dr Allan Pacey.
However, stopping smoking is the "number one" thing men can do to boost their virility, he continued.
The expert noted most people intuitively know that being overweight, smoking and drinking are not good for them, although recent research by fertility supplement Proxeed Plus indicated that men do not associate these issues with their sperm count.
Only 10.2 per cent of males attempting to start a family surveyed by the company had worn looser clothing.
Furthermore, one in ten did not work out at all and just 16 per cent stopped drinking alcohol, compared with 41 per cent of females.
A total of 15.5 per cent carried on eating unhealthy food and fewer than 18 per cent made attempts to reduce their stress levels, although 26.8 per cent of women tried to.
It also revealed that one in five couples regretted that they had not tried to get pregnant earlier.
The morning is the best time to conceive, but only 13.5 per cent of couples said they took advantage of this, with 16 per cent of men reporting to have felt under stress when trying to get their partner pregnant.
A total of 17.5 per cent of females reported that sex became a chore when trying to have a baby, but this fell to 14 per cent when males were asked.
Male fertility starts to decline past the age of 40, with this age being roughly 35 for females, Dr Pacey pointed out.
"People are leaving it too late," the expert continued, asserting that it is "not a good thing" to wait until the man and women are near these ages.
He stated: "Starting a year earlier might make all the difference."