i dont understand what this is... please help

[rdavies2502]

http://cache.amefin.com/analytics.js

Can I ask
what it does?
where would it come from and
why it appeared under the group 'sexually explicit' when it was scanned?

We have also found that, as the laptop is being used at home as well as work, it does have malware on it too.

are both related or not?

I am very inexperienced with this and need all your experts help.

Thanks in advance,