A study into the sexual habits of these women also revealed that their partner is likely to be a complete stranger or someone whom they have met during their break, a major newspaper reported.
The pattern was revealed when online doctor and pharmacy site DrFox.co.uk carried out a study on 2,000 women.
“It’s concerning that many women are not practising safe sex,” Founder of the set-up, Dr Tony Steele said.
“What is more concerning is that people are actually planning on having sex without a condom whilst on holiday.
“People you meet on holiday are complete strangers so you know virtually nothing about them - having sex without contraception is a sure fire way of increasing your chances of contracting an STI.
“Whether on home soil or thousands of miles away women whether they are 18 or 55 need to be practising safe sex and using condoms.''
The study also found a large percentage of these women adopted a head –in-the-sand approach to the transmission of STDs.
The research revealed that one in three get swept away in the moment and forget about using protections, while one in five trusted partners not to give them an infection.
Worryingly, 18 per cent of single girls claim that they are often too drunk to use contraception and eight per cent say they just don’t like using condoms.
Surprisingly, 10 percent women over the age of thirty still feel embarrassed bringing up the subject of protection with a new partner.
The study revealed that women aged between 30-40 years old were most likely to have contracted a sexually transmitted infection, followed by those in the 18-29 age bracket.
The poll found that although the average single woman has had unprotected sex 11 times with a total of four different men, those in the 30-40 age bracket were most likely to have taken the morning after pill.
“The issue of contraception should be dealt with by both parties,” Steele said.
“The consequences of not using contraception for both unwanted pregnancy and for STI’s are huge,” he added.
Photos: Aamir Khan with brother Faisal, ex-wife Reena Dutta at MAMI
Photos: Sonakshi Sinha, Sushant Singh Rajput at Mumbai airport
Spotted: Ajay Devgn and Kajol at an event in Mumbai
Pics: Prabhas, Tamannaah Bhatia at 'Baahubali 2' first look launch at MAMI
'Ae Dil Hai Mushkil' photos: Aishwarya, Anushka, Karan get candid at MAMI