A joint statement issued Monday notes the prevalence of online dating and says the companies' main objective is to keep users safe.
However, the attorney general and the three sites say they will meet regularly to discuss how to create stronger identity theft protections and online safety tools.
Last April, a woman named Carole Markin went public with accusations that a man she met on in 2010 sexually assaulted her on their second date.
Women are much more likely than men to have experienced uncomfortable contact via online dating sites or apps: some 42% of female online daters have experienced this type of contact at one point or another, compared with 17% of men.
Paid dating sites, and sites for people who are seeking partners with specific characteristics are popular with relatively large numbers of online daters: Organized outings are much less common, as just 4% of online daters have attended a group outing or other physical event organized by an online dating site.
In general, online daters themselves give the experience high marks.