Omiai is also available as an app on i OS and Android.
As with other sites, users can hide their Facebook identity until they feel comfortable enough to share with the other person.
Omiai is free for women to use, and for men it costs 1,980 yen per month.
Men can use premium service starting from 980 yen per month.
Pairs is an online dating site with over 150,000 members.
The site is popular with young women, and is free to use — but for men, it requires a monthly fee of 2,500 yen.