The survey also found that more women are putting up girl seeks guy ads.
Eight pct of women go online for sex, while 14 pct of men trawl the net for lust.
Londoners topped among the cities that used the service the most, followed by surfers in Birmingham, Manchester and Glasgow.
Sophy Silver from the website said that it is amen to get to know your partner before meeting up.
"People can get to know their partner better before agreeing to meet up, and they can reject unwanted offers in the safety of their home," the Sun quoted Silver, as saying.