"William" is probably not even based in a Western country and is yet another Nigerian scammer trying to dupe innocent people off their money.
Scammers often use female profiles as well to fool their potential victim.
A few days or weeks later their bank calls, informing the victim the money orders were fraudulent and that they are responsible for the amounts owing. You come across a profile of a young, attractive woman on an online dating site or maybe she contacts you.
The photos are stunning, perhaps professionally taken or provocative, but the description of what she's looking for in a partner is vague.
Remember the golden rule - NEVER SEND MONEY TO ANYONE YOU MEET ONLINE.