They are all scams. People who fall for these don't understand basic human social dynamics.
Women WILL NOT have casual sex with anyone who is not either extremely famous, rich, or insanely handsome (as in a tall, dark Armani model).
If you are an average man like 99% of men are, you ALWAYS have to pay for sex. Be it in the form of a relationship (dinners, housing, nights out at the movies etc) or pure cold cash (prostitution).
Women do not have sex for free after adolescence except with extremely high value men who represent less than 1% of society.
If they do, there is always a catch. For example, in ghettoes they will want to extract alimony from deadbeats, or pop out as many children as possible to live on welfare. So they do not really want the men nor the children, they want the money.
Everything in western society comes down to money. Absolutely everything. Get this through your thick heads and stop living in a fantasy world. There is no Ukrainian supermodel out there who is dying to screw some balding 47y.o guy from the middle of Tennessee.
The ads are frauds, the photos are stock model photos and the women probably don't even know their pictures are being used in this fashion, or they are being compensated for it.
The end.
iHookup worked for me and its free to sign up. Got laid hella times on that site. Its similar to AFF but way better.
With that attitude it's no wonder you didn't meet anyone. I was on the site as a genuine female but most guys look down on you because you are on there. I'm an intelligent professional and to be quite honest most guys who approached me were quite clearly punching above their weight and were very patronising in their approach. What's good for the goose and all that but it still seems most guys are living with 19th century attitudes. For those guys that were not (very few) a great time was had by all.