I tried dating not sex ones though and I found it to be a total waste of time I've had much more success and fun in the field.
My advice is find some wings in your area go out and have a good time trying to pick up women, you might not manage it straight away (i didn't) but you will have such a good time and make some awesome inspiring friends.
If you keep at it you won't need any websites you can just go out and find it or it will bump into you in a club it did with me last week.

Go on get out there I did and I don't regret it