I tried the Yahoo personals dating for 3 weeks and I've found 5 hot girls.?

The problem is they all say there here, (New Orleans area) but when we start to chat they end up being in Nigeria. They all end up asking for money for a visa or pport. They all lost their dad 10 years ago. This seems like a profeesional scam. Comments? Experiences? Are there any legitamate dating services as I'm really interested in finding a lady 25-35 who wants long-term and children, not games or money.