I think the advice to go sleep with another girl is fine. It's advice given by men to other men because it works for MEN. Spreading the seed is pretty damn primal and is not really fraught with peril from an evolutionary perspective.
Wouldn't work for me because I'm female and we have to worry about other aspects of a father to our child in the event we get pregnant.
I've read the advice in this thread given by women and it's really compassionate and wonderful and sound... as advice to other heart broken women. But why can't a guy just go have sex with a willing partner to forget a woman who hurt him without him being an asshole?