The hack, first reported on by British outlet Channel 4 News last week, reportedly resulted in the information of nearly 4 million members of Adult Friend Finder leaking onto an online forum frequented by hackers.
In addition to sexual orientation, the data allegedly revealed included e-mail addresses, usernames, dates of birth, postal codes, the unique Internet addresses associated with users' computers and whether members were looking for extramarital affairs.
But it's just the latest sign that Internet users looking for love online -- or just hoping to hook up -- face privacy and security risks they might not expect.
Middle-aged Americans, 55 to 64, are now twice as likely to try looking for someone online since 2013.
The technology also gained some users among 45-to-54-year-olds.
Fifteen percent of Americans have now used a website or app to look for a romantic partner; three years ago, only nine percent had.
As it happens, the only group which has taken to online dating at a rate like very young adults have been older adults.