[Michael The Disciple]

Back in the 70's The Children Of God group had "flirty fishing". This included flirting and sex to win "converts". The larger issue is of course that we are not supposed to be unequally yoked with unbelievers.

A Christian should not be interested in dating an unbeliever to start with. If they are in a position to witness to someone thats fine. But not so they can start a relationship with them. The motive should be that they may escape the wrath to come and enter the Kingdom.