How do keywords like this convert? Good or Bad?

[More Booze]

Lets say I want to promote Nastydollars Bignaturals.com and I target the keyword: Bignaturals
How would this convert?

Or singlegirls sites, for example inbedwithfaith.com

If I target inbedwithfaith or In bed with faith
Would it convert better than keywords like "Big Tits Teen"?

I've always assumed keywords like this are converting bad since the person that searching for that keyword obviously already know what he's looking for and do probably only want to find more free content.