The woman, from Beverley, has now urged other users to be careful when sending photos and to use paid for sites instead.
She said: "I was using the free site Plenty of Fish and it wasn't going well. I messaged him, we spent the day talking and we exchanged numbers.
The woman said: "I don't know what his game was, or why he chose to play it on me, but I think it's really weird and a bit creepy.
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A woman is warning others to be careful when online dating after claiming she was the victim of a 'sick game' by one user.
The woman, 28, who wishes to remain anonymous, says she was stood up three times by a man called Karl who then ended up posing as a woman and sending explicit messages to her friend.
I believed everything he wrote." • More news: Mum's shock as daughter, 2, steps on 'drug needle' at popular holiday park They arranged a date but Karl cancelled, claiming he had injured himself holding a spinning class.
A further two dates were arranged but all ended with him cancelling at the last minute.
"Karl appeared to be a breath of fresh air compared to the other guys I'd been talking to.