The last 30 days have been a pretty good test for a domain that is made with very competitive search terms. The direct traffic is typed in sex.cam
Code:
Direct % Change +58.91%
Organic Search % Change +130.25%
Social % Change +350.00%
search cam 73.17%
sex 52.44%
camS 5.49%
As you can see the .cam (we get a lot of branding organic type-ins) and some cam without the '.' are matched and ranked more often than 'cams'
All evidence appears that what is to the right of the '.' [.cam] is a ranking FACTOR. Content, semantics then bounce and return traffic are also factors like they are with any other domain.
.cam is just a ranking edge you can buy for around $30year -- that is chickenfeed for a shot at better SERPs. A few sales pay for the whole years registration price
