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But that female may be a 50 year old axe murderer who is really a male!
True for some years back.
Solution, and should be done anyway: Skype with them
Yup, simple as that. Skype. Then you'll see them for yourself, their face and everything.
Back when there was no video converence or Skype, online relationships were far too risky.
Now its as risky as real life ones. I met a young woman at starbucks, turns out she was literally a psycho path (not joking, she was the stand over the bed with a knife type)...and I only found out a couple weeks into the relationship what she was really like.
So any relationship or meeting anyone, online or real life is the same amount of "risk". Thanks to skype, online relationships are just as good as real life ones. And obviously if they refuse to skype, that is a HUGE red flag...time to move on.