The number is a 9.5 percent increase from the same time last year, where 655 incidents were reported.
Police have urged the public to be vigilant and report incidents as soon as possible.
Molest aside, 349 cases of internet love scams in the first half of this year saw victims losing S$22.1 million in total to scammers.
This is an increase from the S$11.2 million lost in the same period last year, from 277 reported cases.
The largest sum lost in a cheating case this year cost the victim S$6 million.
In such love scams, swindlers typically befriend the victim online and ask for money for various reasons.
They disappear once the money has been transferred.
Police say a “significant” proportion of online commercial crimes are committed remotely by foreign syndicates.